Cannot Delete Old Vista Files

When I u/g to 7 from Vista it left a bunch of folder on each partition of my hard drive. They were prefixed by the $ sign.They are large - many Gbs and I want to get rid of them.When I try to delete them I get the usual UAC window asking for permission, which I give, but then I get a window saying that i have to get permission from PBS - OFFICE - PCPBS.I am signed on as administrator and further checking with whoami.exe shows that I am PBS - OFFICE - PCPBS.I have given PBS - OFFICE - PCPBS ownership and full control privileges via Properties/security/owner tabs but I still get this problem.Why do I need permission to delete when it is telling me that the permission is needed from ME???? If I am logged on as PBS - OFFICE - PCPBS - according to whoami, why is it still telling me that I need permission from myself?