Better said any program download won't open. A tech guy gave me my laptop 2 days ago because he was fixing it, and when I started using my laptop again movie maker was working perfectly. But as soon as I installed Avast free antivirus, movie maker stopped working, just as any program that I've tried to download. Every time I want to open it, it says:
C:/Windows/system/d1d2.dll 
I have tried everything to fix it but it's impossible. Any idea how to fix it, please? I already installed movie maker again, checked Firewall, used sfc/scannow, system restore...
Any suggestion, Please?