When I try to install Duke Nukem 3D the setup process freezes to infinity at the end of the blue bar. I have tried rightclicking running as an administrator and disabled UAC, but to no avail;
I have windows 7 ultimate x64 service pack 1;
Thanks in advance!
Could be a corrupt download of the installer. Is the digital signature okay? Right-click the installer and select Properties. Then select the Digital Signatures tab. Select GOG Limited an click Details. The Digital Signature Details should then be displayed and the second line should say whether it is okay or not. See my screenshot attached.
If it isn't okay then you'll need to redownload the installer as it became corrupted when being downloaded.
Running as administrator is still advisable, as is installing outside of Program Files, such as C:\Games\... in order to avoid save game and settings issues.