Windows 7 Build 7601 this copy of windows is not genuine

I have had a ASUS laptop for over a year now, which I bought from Best Buy. Recently, I was trying to do some preventative maintenance on my computer, which included downloading 3 or 4 windows updates which were waiting for me. I also deleted a few different

anti virus programs which I had installed piecemeal over the last year and installed McAfee total protection. Finally, I uninstalled some other programs that I installed and never use, and adjusted some power settings to ensure that I was getting the best

performance I could. After doing all of this, the next time I booted the computer, I got the notification that my version was not valid. When I tried to reenter the key, I received an error code: 0x80070424 Description: The specified service does not exist

as an installed service. I tried to connect to the internet via WiFi as well as by LAN and it won't detect the connection at all. If I look in the devices and printers folder, it won't locate any devices. I connected an external hard drive to start moving

my important files, and windows won't recognize the USB drive. Volume control doesn't work. Restore gives me an error. I'm paralyzed at this point. I don't think I was given a CD copy of Windows 7 when I bought the computer, so how do I do a complete reinstall?

What can I do?

View the thread