I was able to do the repair, but still no luck. Now when i boot to safemode instead of hanging on MUP.sys and then restarting i'm back to getting the BSoD. In addition I dont know if this holds any importance but at the windows logo loading when booting normally, it nows has "Media Center Edition" underneath the logo. Gonna continue searching for resolutions, if you come up with anything lemme know.

Thanks

*Note* All this was done with the original PSU maybe explaining why its back to the BSOD instead of hanging. I will attempt replacing mine in there as well in a bit.

Tried booting up with different power supply after doing the repair, exact same results as with the original power supply. (Safe mode boot up --> hangs at Mup.sys for about 10 secs then BSOD; Normal Boot --> windows logo, one sec flash of BSOD and then the computer restarts)

So I feel like I'm back to square one. Still can't boot up windows even to safe mode, memory and harddrive all passed tests.

Do you have a spare hard drive that you can try doing a fresh install of XP or some other OS on ? If it works with a fresh install, at least you will know its not the CPU or motherboard.

After everything you tried , it sounds like it could be the motherboard, how old is it ?

Maybe the Northbridge went south !

After further research on mup.sys here is what I found: it could be a corrupted registry as per Microsoft, or it can be plug and play peripherals such as a mouse or keyboard,or it can be the BIOS is no longer recognizing certain aspects of your computer hardware.

So...

1. Check your BIOS and see if everything relevant to your system is recognized including your USB.

2. What are your plug&play components and not just the mouse? This could be a firewire card, external harddrive, etc.

3. You may have to do the old tried and true where you unplug everything from your motherboard except cpu, RAM, and monior and boot up. And then one by one reconnect your harware, etc. until you find the culprit.

Tried performing a manual restore of the Windows XP registry, and later trying a fresh install both fail. I'm guessing its the Mobo now though I didnt see any capicitors that are abnormal.

The computer was just under 3 years old =/

I tried using all PSP devices rather than USB keyboard mouse also took out everything and ran it on bare bones still no good. If it was CPU i dont think it would get as far... Still a mystery and we are now looking at a new computer.

Thanks everyone if theres still any suggestions to see if the computer is salvageble feel free to respond. But after a clean wipe and fresh install, i don't know how much more we can do.

Did you try the fresh install onto a hard disk that you know for sure works ?

If so, at least you will now have a newer, faster computer ! I've had mobo's go bad in 6 months. It seems like they are just slapping them together nowadays.

Hey, no I didnt have a spare harddrive to refresh install, but I did run seatools harddrive tests which didnt find any errors. Thats the only basis I really have for that harddrive being good. Oh well. Thanks for all you're support from my sister's behalf and I.

I take it this is a socket 939 system? I noticed you are also running the XP Media version OS and raybay posted under the Windows forum if anyone else was experiencing sugnificant fails with this OS. He has been in the business of repairing for years.

Link: http://www.techspot.com/vb/topic129964.html

I actually just worked on a machine today similar to your problem. Kept blue screening while loading windows and froze on mup.sys as well. I tried to repair the OS and everything, did virus scans in our virus bay and cleaned it out. All the hardware scans that I could. Nothing worked. Until I actually got rid of all the dust inside the machine and removed out all the peripherals.

Then aha! it booted into windows . Just thought I would share

Could have quite possibly been a faulting driver for one of the PCI cards