Help with SDK error in windows

Hi,
Primary Software:LabVIEW
Primary Software Version:8.5
I tried to install an older version of LabVIEW (8.6, 8.5, etc) on Windows 7 and receive the following error when installing:
- Error: Windows SDK function returned an error. (Error Code -12).
Is there a way to stop this please? It is so annoying.
Any help is appreciated.
