Like I said, I will try the above instructions when I go home, but I am afraid it won't work because when I tried similar instructions yesterday I got the following message:
Successfully scanned Windows installations...
Total identified Windows installations: 0
The operation completed successfully.
So it looks like the computer is unable to locate any Windows (Vista or 7), and is unable to locate any partitions--it just sees one whole hard drive as one partition. Even the Windows - System Recovery Options window does not display any recognized OS. Anyway, I will try to follow the instruction when I go home, hopefully it will work.
I downloaded the Partition Wizard bootable file on a USB stick but I doubt my PC is set up to read from a USB stick, and I can't access the BIOS to make the PC read a USB stick (when I press F2 the computer freezes). So I will try to burn it on a CD.
Thanks a lot for your help and I will let you know how it goes.