1. Free up disk space
The Disk Cleanup tool helps you free up space on your hard disk to improve the performance of your computer. The tool identifies files that you can safely delete, and then enables you to choose whether you want to delete some or all of the identified files.
Use Disk Cleanup to:
Remove temporary Internet files.
Remove downloaded program files (such as Microsoft ActiveX controls and Java applets).
Empty the Recycle Bin.
Remove Windows temporary files such as error reports.
Remove optional Windows components that you don't use.
Remove installed programs that you no longer use.
Remove unused restore points and shadow copies from System Restore.
Tip: Typically, temporary Internet files take the most amount of space because the browser caches each page you visit for faster access later.
To use Disk Cleanup
Window 7 users
Click Start, click All Programs, click Accessories, click System Tools, then click Disk Cleanup. If several drives are available, you might be prompted to specify which drive you want to clean.
When Disk Cleanup has calculated how much space you can free, in the Disk Cleanup for dialog box, scroll through the content of the Files to delete list.
Disk Cleanup dialog box
Clear the check boxes for files that you don't want to delete, and then click OK.
For more options, such as cleaning up System Restore and Shadow copy files, under Description, click Clean up system files, then click the More Options tab.
When prompted to confirm that you want to delete the specified files, click Yes.
After a few minutes, the process completes and the Disk Cleanup dialog box closes, leaving your computer cleaner and performing better.
For Windows XP users
Click Start, point to All Programs, point to Accessories, point to System Tools, and then click Disk Cleanup. If several drives are available, you might be prompted to specify which drive you want to clean.
In the Disk Cleanup for dialog box, scroll through the content of the Files to delete list.
Choose the files that you want to delete.
Clear the check boxes for files that you don't want to delete, and then click OK.
When prompted to confirm that you want to delete the specified files, click Yes.
After a few minutes, the process completes and the Disk Cleanup dialog box closes, leaving your computer cleaner and performing better.
2. Speed up access to data
Disk fragmentation slows the overall performance of your system. When files are fragmented, the computer must search the hard disk when the file is opened to piece it back together. The response time can be significantly longer.
Disk Defragmenter is a Windows utility that consolidates fragmented files and folders on your computer's hard disk so that each occupies a single space on the disk. With your files stored neatly end-to-end, without fragmentation, reading and writing to the disk speeds up.
When to run Disk Defragmenter
In addition to running Disk Defragmenter at regular intervals—monthly is optimal—there are other times you should run it too, such as when:
You add a large number of files.
Your free disk space totals 15 percent or less.
You install new programs or a new version of Windows.
To use Disk Defragmenter:
Windows 7 users
Click Start, click All Programs, click Accessories, click System Tools, and then click Disk Defragmenter.
Click Analyze disk to start the Disk Defragmenter.
In the Disk Defragmenter dialog box, click the drives that you want to defragment, and then click the Analyze button. After the disk is analyzed, a dialog box appears, letting you know whether you should defragment the analyzed drives.
Tip: You should analyze a volume before defragmenting it to get an estimate of how long the defragmentation process will take.
To defragment the selected drive or drives, click the Defragment disk button. In the Current status area, under the Progress column, you can monitor the process as it happens. After the defragmentation is complete, Disk Defragmenter displays the results.
To display detailed information about the defragmented disk or partition, click View Report.
To close the View Report dialog box, click Close.
You can also schedule the Disk Defragmenter to run automatically, and your computer might be set up this way by default. Under Schedule, it reads Scheduled defragmentation is turned on, then displays the time of day and frequency of defragmentation. If you want to turn off automatic defragmentation or change the time or frequency, click the Configure schedule (or Turn on Schedule, if it is not currently configured to run automatically). Then change the settings, then click OK.
To close the Disk Defragmenter utility, click the Close button on the title bar of the window.
To use Disk Defragmenter:
Click Start, point to All Programs, point to Accessories, point to System Tools, and then click Disk Defragmenter.
Click Analyze disk to start the Disk Defragmenter.
In the Disk Defragmenter dialog box, click the drives that you want to defragment, and then click the Analyze button. After the disk is analyzed, a dialog box appears, letting you know whether you should defragment the analyzed drives.
Tip: You should analyze a volume before defragmenting it to get an estimate of how long the defragmentation process will take.
To defragment the selected drive or drives, click the Defragment button. Note: In Windows Vista, there is no graphical user interface to demonstrate the progress—but your hard drive is still being defragmented.
After the defragmentation is complete, Disk Defragmenter displays the results.
To display detailed information about the defragmented disk or partition, click View Report.
To close the View Report dialog box, click Close.
To close the Disk Defragmenter utility, click the Close button on the title bar of the window.
3. Detect and repair disk errors
In addition to running Disk Cleanup and Disk Defragmenter to optimize the performance of your computer, you can check the integrity of the files stored on your hard disk by running the Error Checking utility.
As you use your hard drive, it can develop bad sectors. Bad sectors slow down hard disk performance and sometimes make data writing (such as file saving) difficult, or even impossible. The Error Checking utility scans the hard drive for bad sectors, and scans for file system errors to see whether certain files or folders are misplaced.
If you use your computer daily, you should run this utility once a week to help prevent data loss.
Run the Error Checking utility:
Close all open files.
Click Start, and then click My Computer.
In the My Computer window, right-click the hard disk you want to search for bad sectors, and then click Properties.
In the Properties dialog box, click the Tools tab.
Click the Check Now button.
In the Check Disk dialog box (called Error-checking in Windows 7), select the Scan for and attempt recovery of bad sectors check box, and then click Start.
Example of Check Disk Local Disk dialog box
If bad sectors are found, choose to fix them.
Tip: Only select the "Automatically fix file system errors" check box if you think that your disk contains bad sectors.
4. Protect your computer against spyware
Spyware collects personal information without letting you know and without asking for permission. From the websites you visit to usernames and passwords, spyware can put you and your confidential information at risk. In addition to privacy concerns, spyware can hamper your computer's performance. To combat spyware, you might want to consider using the PC safety scan from Windows Live OneCare. This scan is a free service and will help check for and remove viruses.
5. Learn all about ReadyBoost
If you're using Windows 7 or Windows Vista, you can use ReadyBoost to speed up your system. A new concept in adding memory to a system, it allows you to use non-volatile flash memory—like a USB flash drive or a memory card—to improve performance without having to add additional memory. Source here
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