XpUser, DAVEINCAPS, Rockthecasbah, tambes, ace_omega.
i fixed the problem, thanks to your guidance.
who is jam? (please see 60166) he said "You can't use fujitsu siemens disks on a non-fujitsu siemens computer. All you need to do is remove the admin password & to do that, all you need to do is learn how to use google."
I booted up the dell dimension pressing F12 and put the first of three Fujitsu Siemens Recovery Disks into the machine, which you know had Windows XP Professional installed on it.
It then said as follows:-
Press any key to load the disk..
Windows is loading files..D:\FACTORY0.FPT
I put the remaining 2 recovery cd roms in and after about 30 minutes it said, "please wait while windows sets up your computer and it was reading from V:\...
It then said "Please wait while Windows sets up your computer and after 20 minutes, I got the main Vista Setup Window to select, country, currency and keyboard and after agreeing to the Microsoft Licence terms, I entered my new user name and password.
So after 1 week, it's now up-and-running.
I have to install all my software now so if I get any hitches I'll repost.
thanks for your support