Activation After Restore Using PCAngel

It's been infected with some new malware which AV vendors have a generic detection but could not repair.To save time, I decided to use the O/S restore function (replace system files, retain user data) using PCAngel, which seemingly worked ok.However, on system reboot I receive the Windows Product Activation error message, asking me "Do you want to activate Windows now?". If I reply NO, of course I get logged off. But if I reply YES then it goes briefly to a blank version of my desktop and then logs me off.In other words, I never get the chance to activate. I never get anywhere near to getting into windows.To compound the issue I can't boot into safe mode, it attempts to boot, but part way through loading the drivers it restarts without any error messages..I've flashed the CMOS by taking the battery out & putting it back in again & this made no difference.

I'm able to load the O/S partition using ubunthu & see no evidence of WPA_Reset5.I do NOT have any install CD's, the PC came pre-installed & I assume the OEM figured users will restore using PCAngel if required. It is a valid XP install with a valid prodID. If any of you know how I can bypass this state to get the system up & running.