Okay, let's start with the basics first lol.
If I were in your position, this is what I will do:
The usual, first try scanning your system for any viruses or trojans. Next, try to see if there are any suspicious Startup Programs - Change
, In my opinion, MSCONFIG is the best way to do it. If you see anything from there, try uninstalling it.
Next, scan your system files using SFC /SCANNOW Command - System File Checker
. This way, it will scan any corrupted system files and repair it automatically.
The error "0xc0000007b" is usually a stop error (BSOD, based on experience) that is projected when an INACCESSIBLE_BOOT_DEVICE error is triggered. Considering this happens when you open a program, try Disk Check
and see if it works. Did you also happen to install new drives by any chance? Flash, MagicJack, HDDs, SSDs, etc. It can also be possible that there might be some driver errors there.
About the corrupted music library, do you happen to have thousands of songs? I had experience where the index would mess up WMP because of the simple fact I had a whole lots of songs.
And one last thing, can you open up your windows update history (Windows Update - View Update History Details
) and post a couple of the error codes here? That would also be a great help for us in further diagnosing the problems.