Thanks for the quick reply mohawk32. I set about doing an XP repair. However, having booted from the XP CD & loaded the necessary drivers, when XP got back to the DOS repair screen it gave me two otions or Windows for repair:
My XP installation is on C: drive - although I do have an old (non-operational) Windows 2000 OS on drive H: - which is a physically separate drive.
After choosing Option 1, I was then asked to enter the Administrator password. Now I use this every day to log into my PC so I know I can enter it right! (All lower case letters). However, on entering it, it was rejected!
I then went back into 'normal' XP mode, managed to get the Control Panel to open OK and get to the Users window and remove the administator p/w altogether. On the next start-up I went through the whole process again and when I got to the DOS XP repair screen, chose option 1 and simply hit return when it (still) asked for the administrators p/w, I was rejected yet again.
Any idea how I can get round this problem?