Yesterday I bought TurboCad 2018, downloaded and extracted the files, but when I run "TurboCAD_2018_23.5_x64.exe" I get the above error popup. I'm guessing it isn't a TurboCad problem, rather a windows (7 Home Premium) one, but hoped someone from this community might have had the same problem and knows of a solution. There is over 1TB of space on my C: drive.
I have tried running as Administrator, using a different User Account, cleaned up the TEMP & TMP folders, restarted the computer a few times, with no luck to date. Next I'll think of another large program to try to install to see if that works, looking for clues.
Any solutions you know of?