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I have a computer with 50GB of hard drive and it is almost full (I won't get an upgrade for C because is the company computer) I just check and the C:\Windows\Installer directory is eating more of that space. I tried using msizap.exe to delete the unneeded files but I keep getting this error:

MsiZap V 5.0
Copyright (c) Microsoft Corporation. All Rights Reserved

MsiZapInfo: Performing operations for user S-1-5-21-2700949330-2022528980-61785034-4992
Removing orphaned cached files.
   Error opening 66FC8F6438BA7A83992B5AEB05E74E27\InstallProperties subkey of Products key for S-1-5-18 user. Error: 2.
   Error opening 9AC087DE786021C34B9333962F4249F1\InstallProperties subkey of Products key for S-1-5-18 user. Error: 2.
FAILED to clear all data.

What can I do now?

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contact your company's IT departement and have them do it – ratchet freak Sep 19 '12 at 8:04
    
Would love to, but as I know them, it will take three months before the solve the problem – Sambatyon Sep 19 '12 at 11:37
1  
Did you run MSIZAP as an administrator when you executed it? – CharlieRB Sep 19 '12 at 12:27
    
yes, all developers have administrator privileges in their computers – Sambatyon Sep 20 '12 at 10:51

I had similar error messages and was able to get rid of them by following the instructions in this blog. http://wyang0.blogspot.com.au/2010/06/clean-up-cwindowsinstaller.html

Hope that helps

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