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I can't make any changes to Windows Features. Even if I just enter in Windows Features and press Ok I get: "An error has occured. Not all of the features were successfully changed."

I noticed this while trying to install/uninstall IIS. If I try to install IIS from the Web Platform I get:

[Windows package manager]
The referenced assembly could not be found.
Operation failed with 0x80073701

Any suggestions?

EDIT: I have tried
-> Startup Repair. It says it has found problems but is unable to solve them
-> System restore (but didn't had an early enough restore point)
:(

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Can you install other stuff based on MSI? – Teo Klestrup Röijezon Apr 7 '12 at 17:37
    
@Nullable Yes... That error "0x800..." only seems to appear while trying to install IIS. – Cristy Apr 7 '12 at 17:39
    
Make sure your .NET framework is up to date. – Breakthrough Apr 7 '12 at 18:11
1  
Possible idea for solution....d3dal3.blogspot.com/2010/07/… – Moab Apr 8 '12 at 0:59
    
@Moab, thanks, I've read that but I think I'll try a repair with the Windows DVD in. – Cristy Apr 8 '12 at 7:56

0x80073701 is "ERROR_SXS_ASSEMBLY_MISSING".

Sounds like WinSxS (%windir%\winsxs) folder corruption, and/or missing files/links within.

Have you done a disk check (chkdsk)? And/or and a System File Check (sfc /scannow).

Check the windows Event logs for related events to ensure you are not having something like disk or disk controller errors.

Make backups before repairing any disk errors. :)

Also, the System Update Readiness Tool for Windows 7 (KB947821) can help diagnose problems related to a corrupted WinSxS.

You may also have to/want to re-apply your last service pack after the disks have been declared clean and correct.

Additional info here, and here.

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I've installed Readiness Tool, still same problem. System File Check shows everything is ok. – Cristy Apr 7 '12 at 18:09
    
Is it ok for the sfc scan to only take like 1 second and say everything is ok? – Cristy Apr 7 '12 at 18:27
2  
@Cristy, absolutely not. Here it takes several minutes. On an SSD. – Mircea Chirea Apr 7 '12 at 18:39
    
Done chkdsk, no problems found. – Cristy Apr 8 '12 at 8:32

I have fixed this issue by reparing the windows using it's DVD. (Upgrade)
After the upgrade has finished it showed an error regarding side-by-side (SXS) stuff, but everything seems ok by now.

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