Are you logged into the computer as Administrator? If not you probably can't write to that directory because it is read only, if you can even see it at all.
Change the directory to one that exists and is able to be accessed by the account you are logged in under.
Cheers,
Anna Wood
Anna Built Workstation, Core i7 EE965, FirePro V8700, 12 gigs of RAM, OCZ Vertex 120 Gig SSD
SW2009 SP3.0, Windows 7 RC1