Problems with PC please help.

blue screen a few weeks ago , pc went to the pc shop and found a fan was out of action , so got fixed ran alot cooler now ...

NOW getting blue screen again now while simply playing very basic arcade game example ..
pacman !

ALSO WHEN pc goes into sleep mode wont wake up ........

after trying to get it to work several times it will run . at this point im lost to a cause.

i have ran malware , and hijack this pc is all clean, im thinking now more hardware related but any info please or anything i can do to test ....

BSoDs aren't usually viruses from what I gather. What are the details of the BlueScreen? When you boot up after one and log on, it should pop up with a little window with details. That will say a lot...

You have a quad-core processor and 1 GB of memory? Yikes!

Have you researched the STOP codes from the BSoDs?

Woah, that processor dwarfs your RAM. Oh, well. :)

Yeah, it could be other hardware. Have you tried System Restore or backing up and reinstalling, though?

And I know I say this a lot, but it could be that the hardware on your PC is fine, just the drivers aren't. Then the computer wouldn't know how to use the hardware. In other words, it wouldn't be in action.

Any Yellow !!'s in Device Manager ? ?
You may want to post the BSOD...include the gibberish.

Here's how to upload the BSOD information to our Crashes and Debugging forum here which will get you sorted out quickly: Blue Screen of Death (BSOD) Posting Instructions - Windows 7 Forums