Cant delete old windows installation

I have a windows installation in f:\windows that is my old windows 7. I try and delete the directory but it says i dont have write access to the files.
I have taken ownership of the files and folders, given myself full permissions on them too with no success
I have also tried using unlocker 1.9.0 and killbox to no avail

This is windows 7 64 bit.
Any suggestions? Thanks a lot!

EDIT: Killbox record.
doesnt seem to have done anything
Pocket Killbox version
Running on as Blaine0002(Limited Account)
was started @ Wednesday, January 19, 2011, 11:02 PM

# 1 [Delete on Reboot]
Path = f:\Windows

I Rebooted @ 11:04:47 PM
Killbox Closed(Exit) @ 11:04:47 PM

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