I was fixing my cousins laptop via teamviewer.
The problem is that every thing opens with widows media center. Many shortcuts icons have changed to windows media center and every .exe calls this windows media center.
I tried a lot to fix it but didn't succeed.
Local group policy editor is not available in windows 7 home edition. So, gpedit.msc doesn't work.
And I also disabled/manual/automatic all three options of windows media center but that also didn't worked.
I also downloaded a anti-spyware from filehippo but that .exe will also call windows media center. Shift+right click doesn't work in case of shortcuts of skype etc. programs.
Although videos which I run in VLC mdia player do work and also with shift+right click open with option.