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With pc optimizer pro you can safely clean, repair and optimize your computer.
It will help improve your system performance.
Good luck!

Using a registry cleaner can clean up your computer and then make your computer faster,Why?the reason is that there may be some regsitry errors and remnant,corrupt files and temp files in your computer to cause “computer slow”.
Everytime you install and uninstall software on your computer and surfing online you create junk in the computer registry.over time, the registry can grow to enormous proportions, especially if the various programs you’ve installed do not do a good job of deleting and/or updating it’s Registry entries.You need to scan and clean your computer with registry cleaner to make it fast.Good Regisry Cleaner will improve your computer and Internet performance dramatically!
There are some comparison and review of TOP 5 registry cleaners.
You can download and scan your computer for free.

No No No.

Try dumping your history.

In Internet Explorer:
Select Tools
Internet Options
Browsing History – Delete – Delete all but passwords.

In Firefox:
Tools
Clear Private Data – Select all but passwords.

Do a dick clean-up: Start: All Programs: Accessories: System Tools: Dick Clean-up.

Do a disk defrag: At the My Computer Icon on your desktop right mouse click, select open, select your hard drive, right mouse – select properties, select Tools tab, select disk defrag.

Purchase yourself a gig of memory (RAM) and install.
Using a registry booster or cleaner could wipe out registry entries that your PC requires, once removed they cannot be undone. Anytime a rookie screws with a registry you’d better make yourself a backup copy in case you render your computer a paperweight.

How much spyware or viruses do you have on your PC? Such as limewire and other P2P software. This will reek havoc on your PC’s performance.

neather delete cookies,get rid of unused programs and defrag atleast once every two weeks.

FreeRam is a good program i use which frees up ram used by windows after it boots up. this will speed thing sup.

I have an HP Media Center PC & I use the Uniblue Power Suite which has Registry Booster, Spy Eraser, and Speed Up My PC.

You probably have some spyware as opposed to a randomly slowed down computer.

Seek help following the link above.