First and foremost, I've spent the day searching threads on your site before posting and I read the "please read first before posting" threads, so there.  I even tried some things.  Great site BTW.

My system:
Motherboard:  ASUS A8N-E NF4U Socket 939
CPU:  AMD 64 4200 Athlon x 2 939 nforce 4
Memory:  Corsair XMS Twinx2048-3200c2pt (2G) 2-3-3-6
PSU:  Enermax EG465P-VE 24P 460W
OS:  WIN XP Home OEM SP2
Firewall:  Through my Linksys router
Anti Virus:  Norton, ALTHOUGH shut off while I was gaming.  Wanted all resourses on game.
NEW Hard drive:  WD Raptor 10,000 RPM 150G.  Not RAID
Graphics Card:  EVGA Nvidia Geforce 7800GT.
Cooling:  I have upgrades on Chipfan, Processor fan, and HDD fan with Arctic Silver paste/grease.

Notes:  Purchased all from NewEgg  .  The system has been RUNNING flawlessly for approximately 9 months until two weeks ago.  I was having a great game on BF2 and then all of the sudden my computer rebooted with no warning.  Once it rebooted Windows became very unstable and would generate errors and, at times, then reboot.  After discussing with Microsoft support, I did a clean install.  The system runs through the BIOS, formats the HD and then loads WIN up to 52% and then I get hundreds of errors (mostly .dll and some .exe).  I threw some money at a new hard drive just in case and it is brand new.  I've tried another XP SP2 disc and get the same result.  I've restored BIOS settings to default.  Microsoft believes that I had a bad OS disc.  They are sending out a new disc, but the disc is not here, but when it is I'll work through it with them.  I can't believe it's the OS disc.  They believe that the hardware drivers are not loading.  That may be the case, but I don't believe it's from a bad disc.  There is something else going on here.  I'll be curious to think what you guys believe.

My question is:  What is the problem and what could've caused  the problem?

My thoughts at this point:  A stick of RAM went bad perhaps(haven't run memtest86 as I don't have a bootable disc).  My motherboard drivers and/or BIOS went south.  Guesses on my part through bits and pieces I've learned.

Thanks for any support any one can provide.You only need a floppy to run memtest, they are very cheap.Understood.

I didn't post that I have a DVD ROM drive and a DVD R drive and did not install a floppy.  That test would probably rule out a memory error I'm sure.I believe memtest will let you make a bootable CD from an ISO. If you have a machine with Nero, etc. you can burn with try this. That is definitely the first place to start, and it's free.    Test each RAM stick for 30+ minutes, then all together.

A damaged motherboard is possible. A bad CD would ceretainly be another possibility, but I am assuming you have used it before without difficulty. The fact that you tried another XP disc with the same results weakens that possibility.

So get back to us with the memtest report and if all is OK, we'll all be waiting for the report after the CD is received.  Will do and thanks.All computers should have a floppy drive, they are very cheap.Whew, I was able to download the Nero trial version and burn a bootable CD.  One stick is bad and the other has no errors after a few passes.  I've RMA'd them with Corsair.

Thanks a lot for your help and your site.  You guys ROCK!We  do indeed rock. Thanks for posting back.  See that Lifetime warranty is worth the extra cabbage after all...

Glad to hear you got it solved.And, again, thank you for the sincere help!