To run more than one install
First rename the SilentHunterIII folder
If you have WAC3 on it then call it WAC3
Put you DVD in the drive
Click install
Click repair
Viloa
A new SilentHunterIII folder
Patch it to 1.4 ( unless your disc is already 1.4 ready )
Now you can copy the new folder as many times as you like so you always have a clean patched install
Then add GWX to any one of your new folders
I regulary used to have around 5 or 6 installs
ATM I have one with WAC3 on - one with LSH3 on - one clean and 3 with GWX on