USB Drivers aren't working for my devices.

Hello all and and as a disclaimer please excuse any and all of my ignorance, I am not at all very good with computers, it even took me a minute to figure out my OS lol! but i have a serious problem: My USB drivers are no longer reading my phones and other devices the message i get is "USB Device Not Recognized", When i click the message and go through the troubleshoot it gets no where. It's like my computer doesn't even realize that the devices and drivers are malfunctioning, also i don't know if it is related but it seems like files, apps and folders are constantly being deleted without my consent and no one else has access to my pc. i suspect foul play hidden in my system. Any help would be very appreciated. thank you so much everyone!

k i'll try that thank you! i did run HitmanPro Anti-Malware and ran the Avast! Anti-Virus, they didn't find anything though. I'll let ya know the results i get from the link you provided, but i might be out for the evening with the family :) Thanks again, Hope your night is nice!

Hello again! i ran the Malware bytes and it removed a coupe Trojans and PUPs, I ran it a second time and again it found trojans and pups, so it seems to me whatever the malware scan is finding and removing has a way to stay in the system. can u give me a brief explanation of what trojans and pups are?

I also ran the SFC but it seems my computer is now missing a lot (most ><!) of those commands and files.. when i tried to manually run SFC i couldn't even access the operations.

Whatever has happened on my system has erased my hard drive restore points. At this point i'm wondering if there is a way to start windows 7 from the very beginning, like a complete factory reset, and hopefully not be very costly.