My suggestion is to remove your anti virus program, power off and back on, and see if what did not work before works after. I have found AVG to be a HEINOUS program that blocks a lot of stuff. Trend is right behind it.

A lot of programs that purport themselves to be "anti-virus" also think they are doing you a favor and as a bonus put in firewalls, link scanners, etc.... and there comes a point where there is so much security it is like locking the key inside the safe so you don't lose it.

On the other hand, a reload may be needed like another responder said. Something is wrong with the rights on that account if you don't have free reign to roam the range. The default account is supposed to be uber user as John said.