i have make some software to setup garrysmod servers on windows, i have made it with visual basic.
Garrysmod10 Installer Final: http://www.wuala.com/Speedpott/Download/Garrysmod/Server/Garrysmod10%20ServerInstaller%20Final.exe (English)
Multigameserver Installer: http://www.wuala.com/Speedpott/Download/Meine%20Programme/Multi%20GameServer%20Installer%20v1.5.exe (German(English)
I its virus free you can try it here a video from Multigameserver installer:
Have fun :rolleyes: