The Disk Cleanup tool helps you free up space on your hard disk. The utility 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:
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Remove temporary Internet files.
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Remove downloaded program files (such as Microsoft ActiveX controls and Java applets).
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Empty the Recycle Bin.
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Remove Windows temporary files.
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Remove optional Windows components that you don't use.
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Remove installed programs that you no longer use.
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
1.
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.
1.
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.

2.
In the Disk Cleanup for dialog box, scroll through the content of the Files to delete list.
3.
Clear the check boxes for files that you don't want to delete, and then click OK.
4.

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.
IF YOU DON'T FEEL COMFORTABLE DELETING SOMETHING DON'T!
2.
Defragment your hard drive-
This will place similar files physically closer on the hard disk to improve speed.
1. Start-Programs-Accessories-System tools-Disk Defragmenter

2. Click Analyze-After analyzing is done. It will tell you if you need to defrag or not.
3. If you need to defrag. Click Defragment.
DEPENDING ON YOUR HARD DRIVE SIZE THIS MAY TAKE AWHILE.
3.
1.Update you Anti-Virus and run a scan-
2. Trend Micro is a online Virus Scanner. (SCANNING MIGHT TAKE A LONG TIME)
3.If you have a Anti-spyware scanner. Update and run a scan.
Here are a few free antis-spyware programs.
This Should help speed up you PC. If you are still experincing a slow pc, you could need to upgrade your Memory. (Use the above at your on risk)