If you are running McAfee and AVG anti-virus programs at the same time,that is your problem. When you run 2 are more anti-virus programs they don't get along,they destroy files and programs. To repair you may have to reformat. Dan

Hi, you might be able to use some of the tips presented in this article to help you out: <snip></snip>

This original thread is nearly two years old. Posting info here will be of no use to the original poster who has never returned. I would advise those wishing to post advice to choose current threads in which to offer assistance.
For dan2oaks who posted:
While the logs show evidence of at least portions of McAfee on the machine, there is no evidence of AVG on there so while your advice IS sound be sure there ARE two anti-viruses installed and on this one there didn't appear to be.

For Tech Jock who posted a link concerning an AdAware 2009 Installation error, this would not apply here since the poster DID have AdAware on the machine but no evidence it would have been AdAware 2009 and since the thread is nearly 2 years old it is unlikely any of the advice would apply.