Vista - Destination Folder Access Denied

I'm trying to delete some files from Steam. However, I'm frustratingly greeted with this damn message "Destination folder access denied. You need permission to perform this action."

Permission from who? I'm the only account/admin on my computer. This is not the only time I have received some kind of error message reporting to me I need permission/higher access--it's also happened when I tried to "Immune" my computer from known viruses using Spybot - Search & Destroy.

Can anyone help me please? Thanks!

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Destination Folder Access Denied

Hope this may be of some use to any other users!