MS SQL refusing to uninstall

Hi Guys, I have a problem. I had installed MS SQL Server 2008 R2 some time back for a project. Now, when I try to uninstall it, it gives the following error message:

TITLE: SQL Server Setup failure.
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SQL Server Setup has encountered the following error:

Attributes do not match. Present attributes (Directory, Compressed) , included attributes (0), excluded attributes (Compressed, Encrypted).

Error code 0x84B40000.

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BUTTONS:

OK
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What am I supposed to do?