Coprocessor no drivers installed code 28  

I have looked up how to fix this problem but nothing works I have gone to nvidia to download drivers and i download them but co processor still shows nothing. I troubleshoot and the fix wont work because it can not locate any drivers. I dont know what else to do how can i fix this problem? My computer was really fast but now its slow it lags in games youtube videos if i go to 480p sometimes it will lag like crazy as if it was a scratched cd or sometimes delay when people talk the voice will come out later. In games i get random spikes which i didnt get before only on games that were way more advanced more my pc. I have a feeling all this is because my coprocessor shows with a ! inside a yellow triangle that I dont have any drivers installed. Also shows me no decription or model number my pc is home premium could it be that i tried to get it fixed for some other issue before and the man fixed it but he put in amd athlon instead of home premium or does that have nothing to do with this? Ill put in some images of what it shows me.

Thanks I got the driver but it still shows that I dont have it. Am I supposed to put the folder in a certain place?

Yea I got it thanks a lot for the help! It doesnt show that im missing anything anymore. Im just going to test if thats what was making me lag now thanks a lot!.