Windows 7 - Another computer that randomly reboots

Computer has seemed to have issues since its been built, a lot of programs were immediatly installed on it so its hard to say if its def a hardware thing or not.

All the parts were expensive, as this is being used as a quickbooks server for accounting and point of sale.

The computer will occasionally just restart, occasionally it blue screens but sometimes it doesnt. I can never read the error code cause Im not the one that catches it. It always works fine for me, however every few weeks or days it will randomly restart. Attached is the zip file of the logs...my performance log is also in there and is named Performance Log.


Ive been trying to figure it out for a while now and am at my wits end.

Let me know what you guys think.

Thanks

anyone?

any advice?