How do I delete this unneccessary, obscure folder in Vista?

"Boot on a LiveCD that support NTFS. I guess most of the Linux live distros can do it (Ubuntu for instance).

From Linux, you should be able to browse your Windows disk and delete the rogue directory."

"If this update hasn't yet been fully applied the files may still be neccessary. If however the update has been applied then you can delete the files.

The Windows Update or BITS services might be locking these files but you can verify what, if anything has a reference to these files using SysInternals FileMon or ProcMon"