[Chris Herbert]

As I said, I have sorted the problem myself, but if it helps this is what happens..

An error box pops up stating that file is in use or cannot be updated. Retry/Cancel.

Pressing Retry just gives you the same error.
Pressing Cancel just moves on to the next file in the installation process and pops up the same message for that file too.

It maybe just Windows XP related, so would be interesting to hear from anyone else who has had problems installing the .exe files.

Chris