CPU upgraded, now GPU drivers won't work

Hey guys, I recently bought an MSI R9 380 4G with helpful suggestions from here, but even more recently (2 days ago) I upgraded my i3-540 to an i7-860. Now my graphics card isn't properly recognized - neither by Windows nor AMD drivers.

Windows lists it under "Other Devices" as Video Controller (VGA Compatible.) Catalyst / AMD Auto-detect installer says no AMD hardware is installed.

When I first booted after swapping CPUs, Catalyst said my system wasn't supported since it didn't see the R9 380 anymore. I also had to move RAM around for it all to be detected again. The CPU seems to be working fine.

I uninstalled all AMD software and installed my old 9800GT which worked perfectly over night, then uninstalled those drivers and switched back to the R9 380 again - same problem. I can't figure out what else to try, short of a new Windows 7 install. I found documentation of others having this problem, but none of their solutions have worked, and most don't bother to update with any solution. Can anyone help? Thanks.

Motherboard: TH55 HD
CPU: i7-860
RAM: 7GB (1/4/1/1)
PSU: OCZ ZT Series 550W Bronze

Dont use the Auto-detect installer then....
Windows 7 64 http://support.amd.com/en-us/download/desktop?os=Windows%207%20-%2064
Windows 10 64 http://support.amd.com/en-us/download/desktop?os=Windows%2010%20-%2064

Changeing a cpu will give bugs and problems if you havent fresh instaled window's....windows dosent like changes

I managed to fix it. I used the manual driver download + install method before, but it didn't work. This time it did for some reason. Before, it also didn't detect my card, but for whatever reason, it did this time.

This is the 4th CPU, all on different computers, that I have upgraded without having to reinstall Windows. This is the first time I have had any problems whatsoever, but now they are gone! Thank you for the reply, and you were right, too. Maybe this forum is good luck for me.