You didn't reveal much about the machine or what else is installed. I find the best success is a clean install. If someone wants to "upgrade" install, we uninstall every software that we can, including firewalls, antivirus and again every software item we can.
ANY peripheral that can be unplugged is unplugged, then one last BACKUP of what can't be lost is made.
The BIOS is updated and then we try again.
When attempting to upgrade from Win 98 2SE to Win XP pro I managed to get to the stage where I had entered the product key and the comp started preparing (a non dynamic) installation, after about a min the comp hung up i.e. the progress indicators stopped flashing and timer stopped. I eventually pressed exit and stopped the install.
I then realized that I had forgotten to deactivate my Norton virus scan and firewall and thought this may have been the problem and so deactivated them.
I then tried to run the upgrade installation again but the comp just hung up shortly after pressing Install Windows XP, I had to restart the comp. Tried it a number of times to no avail.
Anyone any ideas about how to proceed now