I have checked for viruses and spyware,what would cause my pc to freeze?

if i am doing something on my computer playing a game etc.it stops.

I have checked for viruses and spyware,what would cause my pc to freeze?vista

too many programs are on your pc

I have checked for viruses and spyware,what would cause my pc to freeze?antispyware

Memory....everything runs in memory. Hard drive is storage, programs, when being used, use memory.

You dont say how much you have, but it should be about 1 gig...
There are quite a few things that can cause this. When did it start? How often does it happen? Did you recently make any changes to your computer. If you can provide more info, I may be able to help.
You may have too many programs on your computer. This causes low memory .The system doesn't have enough space for basic programs to work properly and this gives errors and stopping your non-essential ones that ask too much memory -"freezing".

Go to Start-Settings-Control Panel and then to Add/Remove Programs. Uninstall every program that you don't need. Also do some "cleaning" in your local files - go to C and D and check whether there's any file that you can delete. Delete your temporary internet files and cookies (Tools-Internet Options-Delete Files, after that , Delete Cookies).

This should make your computer work better but also make you feel there is order in your computer files.

Hope that helps! Louise
Here are some reasons:

Need more RAM

It's overheating

Too much hard drive stuff wasted

Not rebooting a lot.

If you don't get that stuff, try Googling it.

~Randallrocks

MapleStory IGN: Randallrocks