No problem Kieran.
Just one thing to check as I don't have GTPro4 - is the installation disc a DVD or a CD? If it's a DVD, make sure your drive is DVD compatible.
If that's all OK, insert the disc and then click on
Start > Computer
Under
Devices with Removable Storage you should see that Windows has identified the disc in your drive.
Here you can see I've inserted my
Cakewalk SONAR 8 installation disc into my 'D' drive and Windows has identified it:
Right click on the disc icon and select
Install or run program from your media from the options:
If that doesn't get the installation running, click on the next option -
Open Autoplay:
On the screen that opens, click on
Run Autorun.exe:
If that fails, click on
Open folder to view files:
This will let you see everything that's on the disc -
right click on
Autorun.exe and select
Run as Administrator:
Hopefully, one of those methods will get your GTP4 installed.
Steve