Undo XP Repair?

Hi. How do I uninstall an XP repair process that cannot be completed because I am misplaced the correct activation key to complete the process?

My laptop had been rather slow for a couple of weeks so I proceeded to defrag my hard drive when it suddenly took me to an error message indicating that the file "nostrolkrnl.exe" file was either corrupt or missing. I then replaced the file using the recovery console on an XP installation disk. This however took me to a "blue screen of death" (BSOD) message reading: "STOP: COOOO21a {fatal system error 0x00000000 0x00000000}. The session manager initiation system process terminated unexpectedly with a status of 0xc000026c".

At this point, I proceeded to fix my Windows by using the repair function in my XP Professional installation disk. However I was unable to complete the process as I lost the key (I didn’t think it would ask me for the key if only using the repair function). Please note that the installation disk I used to repair my window is not the original one for my laptop. I bought the laptop "used" with no accompanying disks. The laptop now is in a state where it only prompts me for the activation key (after the Windows splash screen) and does not offer me the option to uninstall this repair.

Please let me know if it is possible to uninstall this and/or (assuming it’s possible) how to repair the BSOD. The BSOD message doesn’t show now, but I figure it will if as soon as I am able to uninstall the repair.

Also note that my hard drive appears to be fine as it passed several tests using Techies Toolkit software.

I’ve recently got a new computer, HP Elite Intel Core i7-920 2.66GHz Desktop Computer. The day i got it, and got it all plugged in, it crashed. For the beginning it was fine, browsing internet, going on msn, surfing the web, etc. all of a sudden it freezes on me, the mouse works and so does the keyboard. however the screen wont let me do anything, therefore i had to manually shut off. I figured the problem was registry corruption. I tried reg-cure and was not able to run it for my computer had a Vista 64bit premium home edition. So i used CCleaner and all worked well. After a while, my computer freezes again, this time i left it idle, and it was in screen saver mode. When i moved my mouse to return to my desktop, the screen freezes and this time so does the mouse. After waiting a bit, i got the blue screen of death. So i turned it off again, and all.. To make a long story short, My computer keeps on freezing for no reason during web-browsing/doing nothing/screen saver/gaming/ etc. Occasionally i would get the blue screen of death, Sometimes from the freeze or for no reason. I have tried Registry clean up, and it still happens. Any tips from people who keep they’re Vista from crashing would help.
I dont believe its any virus or spyware.

I installed windows xp home edition on an older computer(emachines, 366mhz, 128 ram) and now it crashes constantly. Sometimes I get the blue screen of death. It always says there is a different reason for the crash though. Other times it just reboots. I have tried registry cleaner programs but they seem to have made the problem worse. My computer only crashes occasionally if I use one program at a time. Using morpheus, winamp, and windows media player seem to increase the frequency of the crashes. Maybe my computer shouldn’t be running windows xp? But is there anything I can do to make my computer run smoothly?
Windows xp needs 128mb to run, so my ram should be good enough.

Now I’m no rookie, but I’m no guru either, but this problem will stomp even pc veterans. What is wrong: computer goes straight into BSOD before loading windows. What caused it: I went to "start" >> "run" >> "msconfig" then "safeboot" now it goes straight to the BSOD and its says video driver failed to initialize. What’s funny is that I can run other software programs just fine (like windows repair/recovery software) and the video is just fine. I’ve even ran Ubuntu over it just to see if the video works and it does. But this is the kicker, Dell wont even help because the laptops’s out of warranty as of two years ago, I know I can do a fresh install, but I’m trying to save all my pics, music, movies etc…So my question is this: how do you return it to normal mode if you can’t boot windows, what boot software can I obtain to troubleshoot/repair from outside windows, or how to get into Windows period, I can handle it from there, just gotta get in.

P.S. BSOD=blue screen of death (if you didn’t know that then maybe this question isn’t for you to try and answer…but go for it anyhow 😉
Thanx Kobra, but I know the ram is good. Steve, I thought of fixmbr, but I was afraid of the warning it gives me about partitions may not being accessable later. However i did mention the error message on bsod(video driver failed to initialize.) DJ maxx I recall seeing that option before, but neve had a chance to use it. I have a "Super XP" disk so I’m pretty sure I can copy, but if I use Steve’s method and it does render my partitions useless, can I still install windows as you’ve indicated to retrieve my data, then format and install once I’m finished? (and Steve when I start to run fixmbr, it does say: "This computer appears to have a non-standard or invalid mbr" so you may be onto something. I’m just being so cautions, because this isnt my computer, I’m fixing it for a friend, otherwise I’d just play around with everything.