Error 7 (Windows error 126)

Doublechecking ... have you also check on your .NET framework as per the following document?

[iTunes for Windows: "iTunes was not installed properly. Please reinstall iTunes" message|http://support.apple.com/kb/TS3074]

Same issue as above. I have tried everything you suggested yet all results are the same. I continually receive the erro 7 windows error 126 and have also received:An error occurred during the installation of assembly ‘Microsoft.VC80.CRT, version=”8.0.50727,4053”,type=”win32”,publicKeyToken=”1fc8b3b9a1e18e3b”,process or Architecture=”x86”. Please refer to Help and Support for more information. HRESULT:0x800736B3.

My errors also started with an update around Dec 20th 2010.
Please help!
Thx.

I had a similar problem and tried all of the solutions presented. What worked for me was to run iTunes in a compatibility mode. Right click the iTunes icon and select properties. Click on the compatibility tab, under display settings, check "Disable visual themes" You will get a window pop-up when loading iTunes requesting that iTunes should not be run in this mode, but hit ok and iTunes should load up.

Thanks for the suggestion, no luck, same errors. Thx.

Hi Had the same problem. Bloody annoying.
Anyway finally fixed it by copy all missing .dll files from someone else who had loaded ITUNES.
Luckily my girlfriend had the files and i just copied the missing files into the same directory. By comparing what she had and what i had.
If this does not work tryto overwrite the Mediatoolbox.dll file.
Then i tried Itunes and it worked again.
Files can be found in.
C:\Program Files\Common Files\Apple\Apple Application Support
Then just copy and paste missing .dll files into this location.
Hope this helps anyone.