Windows 7: Trouble when installing some programs

Hi I have a problem with some installers. The installer buttons (Next, Cancel etc) are not working (pushing them makes no difference). The problem is with SolidWorks 2014 installer and some others (unfortunatelly can't remember right now, it was some time ago but this is the first time I have a problem with a program I really need). I also have problem with Visual Studio and Atmel Studio (I could instal them but I can't sign in to my account in VS, it just shows a empty frame. In Atmel studio it also shows an empty frame when I try to access Atmel Gallery from the program). I have searched for solutions for these specific problems but nothing works. The problem seems to be with Windows. I reset IE (11), confirmed that scripts are allowed, tried with firewall (Comodo) off and AV (Avast) shields off. One solution described some buggy registry entries in internet zones (from activeX installation), I didn't have them. Please help.

A little update about my problem: I had SolidWorks 2012 installed on my computer before and I just checked that I can't install it now, same problem. So there wasn't a problem in the beginning. Also, a week ago I had to reinstal windows but the problem was before that also. Any help would be greatly apreciated.

Another update: also can't sign in to Skype

Since you seem to have multiple issues, try a Clean Start and see if you have a conflict

Troubleshoot Application Conflicts by Performing a Clean Startup

A Guy

Hi Bosskardo,
This is the correct method for installing. How to Install.pdf

I'm pretty sure I didn't have this problem but not sure.
I ended up reinstalling Windows because I really needed to install SolidWorks. The problem disappeared.