|"Fatal Error: Error prevents setup from continuing. Windows is unable to start because the registry could not be updated. Contact the computer manufacturer."|
Is that more or less the exact message ?
Was there any other text on the screen ?
If so, tell us what it was/is.
"Trying to perform System Recovery ..."
Were you using a Recovery disk or Recovery disk set for the specific model, or a Recovery program built into the hard drive's data, or are you trying to install XP by booting from an XP CD, or were you trying to load a previous restore point in System Restore ???
You can't run XP's Setup from the Windows installation you are booting from.
Why were you trying to re-load the original software, or just XP?
What were your symptoms ?