Ethan,
By any chance do you have a file named "/etc/vmware/not_configured"? If so, remove it.
Also, just to be sure, what do you see in /lib/modules/`uname -r`/misc, e.g.,
$ ls -l /lib/modules/`uname -r`/misc
total 376
-rw-rr 1 root root 36509 2008-12-07 01:07 vmblock.ko
-rw-rr 1 root root 95745 2008-12-07 01:07 vmci.ko
-rw-rr 1 root root 118128 2008-12-07 01:07 vmmon.ko
-rw-rr 1 root root 79897 2008-12-07 01:07 vmnet.ko
-rw-rr 1 root root 34834 2008-12-07 01:07 vsock.ko
