Unable to install the main Medieval 2: Total War game in Gold

[Munch]

Hi.
I am in a spot of trouble, well that's lie, I am in big technical trouble.
Basically, I installed M2TW Gold fine first time and then uninstalled everything because it kept crashing. Then, as anyone would I tried to install it again. However, this time I only get the options to install the kingdoms expansions - I can't install the main game. Therefore I go into the disk files and try to manually install. However, it says that all M2TW products are fully installed, when only the kingdoms are. I then went into Program files and checked that the files weren't there, and they weren't, the original game also wasn't in Add/Remove programs as I had already fully removed it.
As a consequence I am now completely stuck and cannot play the main game as it won't install, let alone the kingdoms expansions which need the main one to run.

Someone please help, as I have waited ages to play this game, and now cannot.

Cheers

[irishron]

You need to clean your registry. If you have Vista, read the sticky thread at the top of this forum.

[Munch]

Yes, I've already done that, but if you would give me a clear, definite way of doing it, maybe I've done something wrong.