Help! my pc restarts or show a blue screen when playing games or just even playing multi-media files?

Sounds to me like faulty hardware might be the cause. If this was my system I would reinstall windows to a spare hard drive and see if it continued to have problems. You could also download a Live Linux CD and run that for a while. If it crashes then you know it's not your operating system and hardware is failing. I don't necessarily agree with all the bad memory ideas. It may be memory, but bad memory will cause it to crash anytime not just during times when your using sound/video mostly. Good chance you have a failing video card or sound card. Check to see if the fan on your video card quit working. That would cause it to overheat and crash.

the reson could be many things. 1. you might have a virus that happened to me and i had to reformat the computer, 2. you might need more space (memory)

Buy a new PC, that one u are using is old you bought it 17 years ago.....

you probably have faulty ram, or cruddy clock settings. take it into a professional and see what they can do to stabalize your system. increasing your ram or pagefile in this case will make things worse. do your self a favor and take it in :) (will cost you less in the long run, too) virtual memory, btw, is "A program instruction on an Intel 386 or later CPU can address up to 4GB of memory, using its full 32 bits. This is normally far more than the RAM of the machine. (The 32nd exponent of 2 is exactly 4,294,967,296, or 4 GB. 32 binary digits allow the representation of 4,294,967,296 numbers — counting 0.) So the hardware provides for programs to operate in terms of as much as they wish of this full 4GB space as Virtual Memory, those parts of the program and data which are currently active being loaded into Physical Random Access Memory (RAM). The processor itself then translates (‘maps’) the virtual addresses from an instruction into the correct physical equivalents, doing this on the fly as the instruction is executed. The processor manages the mapping in terms of pages of 4 Kilobytes each - a size that has implications for managing virtual memory by the system." what the first guy was describing is known as a pagefile or swap space.

The problem might be that U have a low capacity RAM or else u r might be having a problem with ur Graphics card.

have you run a virus scan in safe mode? sounds like a bug

You might need more RAM or a better CPU. Or try Windows update...you know how it is with Microsoft. EDIT: If you are low on RAM, try adding virtual memory (hard disk space that behaves like RAM): RIght click My Computer, Advanced tab, click Change under virtual memory and follow the instructions from there. Note that VM does not take the place of RAM...more RAM is always better, but it helps. Hope this helps.