Help! Videocard Drivers Wont Load on Startup!

I installed ATI Radeon 9600 Pro 256MB Video Card on my computer, and what happens is that when I restart, sometimes the videocard drivers load, and sometimes (usually) they do not–even though it says “device working properly” in Device Manager. I have tried uninstalling and installing the drivers and trying both the drivers on the CDRom and also the newer drivers on the website—it seemed to solve the problem for a day, but the next day the same thing is happening. I did not have this problem with the 9200, and I did not have the problem the first few weeks with the 9600 Pro—only now. Is it possible that this is a compatibility problem with the motherboard? (Foxconn 865A01)? (They told me it should be compatible). I have Pentium 4 3.0Ghz Prescott, 512MB RAM. HELP!