i got a pc from tiny a year & half ago 3 months after purchasing it i have had nothing but trouble with the pc rebooting itself whilst performing spyware scans ,converting films into dvd ,playing games online & cd rom games could someone please tell me whats going wrong .

It justs restarts? No error? Any problem when it restarts?

Could be an overheating CPU. Download Everest and monitor your CPU temp.

http://www.majorgeeks.com/download4181.html

In the program go to > Computer > Sensor

Then do a film or scan trying to push the machine and monitor the temperature at the same time. If it gets up to 70C that might be the problem.