win XP BSD at boot up

Dell OptiPlex 330
Core 2 Duo E4600 processor
2 gig ram DDR2
250 Gig SATA Hard Drive
Win XP Home
Purchased 2008, new motherboard, memory and CPU in 2011 (under warranty)

My computer fails during boot up and gives me the BSD. Here is what happened the first time. I got a Windows boot manager is missing or corrupt error
I woke up the computer to start working. the desktop showed up but anything I clicked on showed the hourglass but never opened. I tried several different programs and nothing was happening. the hard drive light wasn't flashing either so after 5 minutes of waiting I did a hard reboot by holding the on button. the computer stopped at the screen to select safe mode, last known good configuration, normal boot etc. I selected boot normally. It got past the win logo with black background background and then went to the Blue screen saying a problem occurred and stopped. I rebooted several times trying the different boot options including safe mode with no luck.
the stop code was 0x0000007B
1. Rebooted and ran diagnostics - passed
2. Rebooted and ran Memtest from CD - passed
3. Rebooted and went into setup and reset the Bios to factory defaults - still BSD at startup
4. I don't remember how I got to a dos window now, but I did get to one and run Chkdsk /f early on and found no bad sectors or errors.
5. Rebooted with the Win XP installation disk to try and repair windows but it also failed, and went to the BSD when it tried to start up windows from the disk. also tried a Win 7 install disk, same problem BSD
6. Rebooted and ran Knoppix from CD. It booted up and I could see the hard drives, open picture files, PDF's etc. from the hard drive.

Any ideas?
Thanks

 

I inserted the windows xp install disk. it loaded files for about a minute and then it said "start up is Starting Windows" then went to the BSD with the stop code was 0x0000007B.

I took a look at the windows KB link but that was over my head.

what should I try next?

 

I did not try to install win7, It was suggested in other posts prior to starting this thread to just tried to get to the system restore with Win XP or Win7. However, neither system repair disk would load for me to even get to the option list to run system restore or install an OS.

I tried several time to get a different win xp system restore disk that I made in 2011 to load and it finally did load. I clicked on Start up repair and got the message "Start up repair can not repair this computer automatically"

this was the message under that error message:

Problem Signature
ProblemEventName: StartupRepairOffline
Problem Signature 01: 6.1.7600.16385
Problem Signature 02: 6.1.7600.16385
Problem Signature 03: Unknown
Problem Signature 04: -1
Problem Signature 05: ExternalMedia
Problem Signature 06: 1
Problem Signature 07: MissingBootManager
OS version: 6.1.7600.2.0.0.256.1
Local ID: 1033