I was trying to fix my friend's desktop computer that has frustrated me the most !! I took his 18GB drive out of his computer because i was having problems with installing windows XP on his hard drive. So, i plugged his drive on my computer and installed the windows XP professional SP 3, updated it, installed the anti virus software. Now when i plugged the same hard drive on his computer instead of getting the normal windows back, i get the follwoing message: We apologize for the inconvenience, but Windows did not start successfully. A recent hardware or software change might have caused this. If your computer stopped responding, restarted unexpectedly, or was automatically shut down to protect your files and folders, choose Last Known Good Configuration to revert to the most recent settings that worked. If a previous startup attempt was interrupted due to a power failure or because the Power or Reset button was pressed, or if you aren't sure what caused the problem, choose Start Windows Normally. Safe Mode Safe Mode with Networking Safe Mode with Command Prompt Last Known Good Configuration (your most recent settings that worked) Start Windows Normally Use the up and down arrow keys to move the highlight to your choice. Seconds until Windows starts: 30 If I SELECT any of the above options, it freezes his computer. I don't know what is going on because a fresh copy of windows XP is installed on the drive and even an anti virus (not it matter) is also installed and the drive had worked on my computer. But for some reason it is giving me hard time running the same drive on my friend's computer.