How to fix error 0x80004005: Unspecified error (On windows 7)?

It has been happening in the past few months since i have been using AVG Antivirus Free Edition, I have been trying to rename music file (album, title etc...) but every time i try it comes up with this error, I am computer literate so if anyone could help me fix this it would be muchly appreciated.
Update: I am the only account holder on this laptop, as the admin, I have tried all three suggestions and nothing seems to have worked, I have also used AVG PC TuneUp 2011 which stopped some services, may that be a reason too?
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