With your provided info, no one could guess what's wrong. For example:
- How many updates are you trying to install ? In other words, are they recent or a full bunch of older ones ?
- Is the crash specific to only one update (if so, provide its number) ?
- Is your PC Parasites Free ?
I'd try to download them (see Q323166 - "How to download Windows updates and drivers from the Windows Update Catalog") and install one by one in Safe Mode. It's a longer process, but it can give clues of what's wrong.
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
whenever i download any windows update, upon rebooting my machine crashes and I have to restore from an earlier point of XP
does anyone know why this would happen ?
the system has a firewall and up to date virus protection