Wow, thanks for the quick replies.
I right clicked the file and checked that it was set to Run as administrator. I am also an administrator user. The file is also set to run in W98/ME compatibility mode. I tried the same with the installer too, running it as normal, as an administrator and as an admin in compatibility mode.
Would someone be able to email the dll files? My address is " pleasegivegenerously at hotmail dot com ". That's worked before with something else, and as I've got fewer dll files than everyone else it's gotta be worth a go