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Windows 7 wont let me install new software as it says another install is in progress. There is no known install running and msiexec.exe is not running. Any ideas?

Update: after some poking around it appears the .net fw 4 is corrupted and after some googling im attempting a fix.

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After some trial and error, I deleted the windows\softwaredistributions folder and deleted all the failed installs from the root of the C: drive. that seemed to do the trick.

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