Sorry I'm late getting back. I was on a patrol in GWX.
In the Ubisoft folder is Silent Hunter III. You have to delete it after Uninstall.
GWX install demands it done a certain way.
If you do't do the install the way the GWX Manual says you will always have problems if an install at all. Sorry that's the way it is.
Btw I have the files to eliminate haveing to leave the SH3 CD in drive. And TWICE it BORKED the whole install about 3 or 4 patrols later.
You think I wasn't pissed.