"There was a problem starting nvcpl.dll" How to fix?

Hi! I seem to have this problem since I had a power cut on my computer. The error shows up on windows start up. When I searched on the internet for any kind of fix, I found out that it had to do with my nvidia video card. It said that it was in some way infected with Windows 7 Home Security 2011 and that I couldn't open any .exe files. But I could run .exe files just fine. The problem is on my gpu. It seems like it is not working properly. I realized this when I played a multiplayer online game I would often play and it started to lag in-game. I thought at first it was because of my internet connection, but it wasn't that. I didn't have hardware acceleration turned on, which made me think that I found the solution, as I used to have it on. I tried turning it on in chrome://settings but it didn't work. Every time I checked at chrome://gpu, almost all of them were Software Only. Well I tried to force hardware acceleration by enabling it in chrome://flags but it still didn't work. I was confused and I didn't know what to do. I searched about this error again and it was suggested to update or reinstall nvidia drivers. That's what I did. I installed the Nvidia Driver Setup but when I opened the setup it said it couldn't continue because my hardware isn't compatible. I was so annoyed at this point! I tried checking for updates in Nvidia Experience and during that process, another error shows up saying: "There was a problem starting streamci.dl" and the setup crashed! I just don't know what to do! Please Help me out! 

I just want to know why chrome doesn't allow hardware acceleration and if my gpu is working properly or not.

Thanks in advance!

EDIT: I also can't seem to open nvidia control panel.

Computer: Windows 7 64 bit

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