Ive got a computer I think might be underpowered at full load. Windows 7 will lock up, but if you wait a min or two and it will start responding again, but then it will just lock back up. It took me 10 mins today to get the task manager open to try to close stuff but its so unusable pretty much your only option to hold the power button and shut it off. Once Windows is back up there is nothing in the event log besides the unexpected shutdown.
The PC is an E6400 on an Intel branded 965 board with 4x1GB DDR2 RAM, an 8800GT and 4 hard drives in a 2 raid arrays. This is the PSU it has http://www.newegg.com/product/product.a ... 6817103937
Normally it runs GPU FAH and today I was rendering files in CS3 when it started locking up.
I would not call what you are experiencing symptoms of your hardware being underpowered. Instead I would call it symptoms of faulty hardware. One of the components in your PC is probably going bad. Try running memtest.
If it makes you feel any better, I have a Dell Dimension V350 next to me right now and it has:
350MHz Intel Pentium II Processor
384MB of 133MHz SDRAM
Intel 440BX chipset
Samsung SM-352B Combo Drive
Western Digital 320GB 7200RPM PATA Caviar Drive
Western Digital 200GB 7200RPM PATA Caviar Drive
Promise Ultra133 TX2 Controller
ADMtek NC100 Network Everywhere Fast Ethernet 10/100 NIC
ATI 3D Rage Pro integrated graphics card
Yamaha YMF-724 integrated sound card
When functioning properly, your hardware should be able to run circles around it.
Disclaimer: I over-analyze everything, so try not to be offended if I over-analyze something you wrote.