I also have a phenom 925 on a similarly old motherboard. I used to get random blue screen errors once in a while, but after I updated the bios and all the motherboard drivers for windows 7 64 bit, the blue screens went away.
On the bottom left side of the compaq webpage you mentioned, there is a box saying "support for this product." Click on the first item mentioned "Software and driver downloads." Download and install ALL the stuff that they have there for your operating system. Good luck.