I have a brand spanking new rig, specs:
Intel DZ68DB mobo
Intel core i7 Quad 2600 3.4
2x 4GB Kingston DDR3-1333 10600
Stock cpu cooling
Seagate 500BG SATA HDD
Samsung 22x DVD-RW
Coolermaster Extreme 600w PSU
Club3D Geforce GTX550 TI OC Coolstream
Windows 7 Ultimate 64bit
The problem is that the machine hangs or rather freezes randomly, and the only way to resume is a hard reset. Then eventually, it freezes again. Sometimes it randomly reboots as well. I have downloaded and installed the latest drivers for the motherboard and bios, and updated them. It didn't help. I have no idea what else I can try.
Your thoughts on the matter are greatly appreciated.
Any chance something is overheating? You could install the Intel Desktop Utilities app to monitor the temps. I had something similar on my old PC when a stray fan wire was stopping the CPU fan. Also are you running the most recent nvidia driver?
My new PC is almost identical to yours and I did have this happen once, just flipping to a new tab in IE. But since it only happened the one time, I didn't troubleshoot it further.