windows 7 multiple malfunctions

Hello everybody,

It all started with Windows Media Player (The file wmploc.dll has a version of 12.0.7601.19148 where 12.0.7601.18840 was expected), then Windows Update did not work anymore, then the PC refused to shut down (it shows a shut down message but won't stop even after 24 h), now I can't uninstall softwares, sometimes sound driver does not function but I can't access device manager (message saying it did not reply in a timely manner or something like that).

I tried a lot of potential solutions but with no success (virus removal tools, registry cleaners, etc).

I hope my ordeal will stop here!

Repair suggestions:

 

NOTE:  Try a clean boot to see if the problem clears up that way:  http://www.thewindowsclub.com/what-is-clean-boot-state-in-windows
If it does, then different troubleshooting steps are called for.

Here's some repair/recovery/restore options (in this order):

1 - Startup Repair.  Run it 3 times, rebooting in between tries.

2 - System Restore to a point before this started happening.

3 - DISM/SFC repair (DISM doesn't work with W7, although SFC does)  - doesn't work if you're not able to boot to Windows (let me know and I'll post a way to do it from Startup Repair)
    

Then please run the following DISM commands to see if there's any problems with the system (from an elevated (Run as administrator) Command Prompt).  Press Enter after typing it:
   

Dism /Online /Cleanup-Image /RestoreHealth

    FYI - I have repaired systems using the last command even though problems weren't found with the first 2 - so I suggest running them all.

    From this article: http://technet.microsoft.com/en-us/library/hh824869.aspx

    You can also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption. Include the CBS log (located at C:\Windows\Logs\CBS\CBS.log) if you'd like to have a Windows Update expert check it (I don't check them because I can't read them)

4 - RESET using the "Keep My Files" option (W8 calls this a REFRESH; W7 and earlier doesn't have this function)

5 - Repair install of the OS (Thanks to FreeBooter!):
   

"How To Perform a Repair Installation For Windows 8, 8.1 and 10"
    https://www.winhelp.us/non-destructive-reinstall-of-windows-8-and-8-1.html

    "How to Do a Repair Install to Fix Windows 7"
    http://www.sevenforums.com/tutorials/3413-repair-install.html

    "How To Perform a Repair Installation For Vista"
    http://www.vistax64.com/tutorials/88236-repair-install-vista.html

    "Non-destructive reinstall of Windows XP"
    https://www.winhelp.us/non-destructive-reinstall-of-windows-xp.html

6 - RESET using the "Remove Everything" option (W8 calls this a RESET; W7 and earlier doesn't have this function)

If using W7 or earlier, this can be accomplished by resetting the system by use of the recovery partition/recovery disks/recovery drive.
If you don't have them, you can usually order them from the OEM manufacturer of your system ( US points of contact here:  http://www.carrona.org/recdisc.html )

7 - Wipe and reinstall from the Recovery Partition (if so equipped)

8 - Wipe and reinstall from Recovery Media - to include deleting all partitions.
If you don't have them, you can usually order them from the OEM manufacturer of your system ( US points of contact here:  http://www.carrona.org/recdisc.html )