K7N420 pro boot problems?

my K7N420 pro has been working great for at least a year but has recently developed a problem...
I leave my PC always on most times and last week when i wiggled my mouse to wake it up nothing happened so i hit reset. It got to various stages of the boot up process but kept resting it self or sticking either at the bios msi splash screen and some times almost booted windows but said my c:/windows/system32/system file was corrupt and that I'd need to reload my recovery disk.
to make a long story shorter, I discovered that one of my case fans was not spinning, I pulled the power for it and then everything was fine again, for a week....
last night I loaded a new program and had to reset and the same boot issues happened, only somewhat worse, happened again. this time ocasionaly the splash screen was all distorted or it would prompt me that my bios checksum was invalid and asked to put my system floppy in. but on each power off or reset, it sometimes got past that but would hang saying my system file was corrupt again. I kept resetting it with different results and it eventualy booted and is now running fine though I am afraid to reset.
I have a suspicion my bios battery may be the cause? PC alert tells me my bios battery is at 3.10 volts? I went into my bios when it wasnt booting and everything looked in order there, even monitored my voltages in the system health section and all looked good with the excetion that my 3.3 voltage line seemed to fluctuate quite a bit. between 3.2 and 3.3 and is still shown to do the same in PC alert even though im up and running now.
could this be my bios battery? any help, or suggestions appreciated.
OdBall
3dmark2001 score = 8280
http://service.futuremark.com/compare?2k1=4104680
mobo = K7N420 pro
cpu = AMD 2000xp
ram = 2x 256k pc2100
vid = gforce 3 ti-500

Sorry, I don't know much about my PSU other then its a generic 350W that came with my case. as my sytem is still running now, its dificult to get at the label to tell you more.
The reason I think its my bios battery or the bios prom is that I only have trouble at boot up time when the system needs to read it. Is their a bios diagnostic I can run while my system is up and running?
As I said in my initial post, I rarely turn my system off so both times I had problems the system was warm inititaly. On both ocasions I let it cool down after several attempts to reboot but it made no differance. The first time, I was sure that my psu was the issue for it booted clean after unplugging the stuck case fan. but when it exibited the same symptems the next time I reset, a week later, I'm not so sure any more. thats why I posted my concerns here.
I know that the stuck case fan could not have been good for my PSU and am prepared to replace it, I just feel that if it were my PSU at fault it wouldn't only cause me problems at boot up... I have been up and running again for several days now since that last reset with out any issues.
I have everything I need backed up now and will attempt to reset it again this weekend when I have time to play with it. Actualy, I think I'll just shut down and replace the battery first, I suppose it would be prudant to replace the PSU as well before attempting to power back up but then I'll never know for sure what was at fault if it works.

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