Wow.

What computer? CPU? Motherboard? Memory? What mining software? What hardware? GPU? ASIC? FPGA?
Jeesh, give us a clue...
Sorry...Im running
CPU: AMD fX-8120
GPU: two 6990
MB ASUS m5a97 r2.0
i had the miner running all night and the computer didnt restart...it only seems to restart when im running the Client and Miner at the same time.