In a command prompt, type path and make sure C:\Windows\System32 is in the path.
I still get the message it's an unrecognized command when I type C:\Windows\System32. Tried just C:\ as well and got the same unrecognized command. However, when I type in D:\ or G:\. 2 partitions on the drive, it switches from
C:\Documents and Settings to G: or D: but it won't switch to C:\ or C:\Windows\System32. Tried typing in C:\ and C:\Windows\System32 in G:\ and D:\ and got the unrecognized command.