Probably many of you already know it, but have you ever tried to do only one installation for any, using a very simple and smart program called Jone Soft Generic Mod Enabler (JSGME)?
I strongly suggest it for the people tired to do every time a new installation for every new mod and track...
I never experienced any issues of any kind using it for GTR2/P&G2/GTL, so if you want to solve your troubles, it worth a try
Here is the download link page:
http://www.users.on.net/~jscones/software/products-jsgme.htmlThat's the User guide, with all the steps to install it correctly, and the instructions to enable/disable every mod correctly:
http://www.users.on.net/~jscones/software/documentation/JSGMEUG.pdfIf you think that it's too difficult to use it... than just ignore my post, but I'm not an expert of pc, and reading the guide, is all explained very easily, so once you're familiar with it, it's a very simple program to use.
If you think that it could be useful, I can open a topic, in which I can answer to some installiation or enabling/disabling mod issues.
You decide
P.S. The only issue in the case you would like to install it, it's that you have to start by a "clean" installation without mods... but it would be the last time you should do it