Hello Yuvaraj N,
I checked the logs, all your logs showed Error 0x80070643: Failed to uninstall MSI package. However the error 0x80070643 is a general error without detailed info. In order to know details, please check the specific package for example, the TFS 2012 Storyboarding Package msi log, search for "value 3" error and paste it here.
Since I'm also not sure of the reason, I will recommend you download Visual Studio 2012 ISO, then check its checksum with this toolhttp://support.microsoft.com/kb/841290 The checksum can help us know whether your installer is healthy or not. You can refer to here for the right checksum:
http://www.microsoft.com/en-hk/download/details.aspx?id=30654
If you are sure your iso passed the checksum test, you can then use that installer to remove your VS.
Best regards,
Barry
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