After Installing SP2, my start menu is inoperable....

my start menu has a black box over the left half where
most used programs/email&IE are and the other half...most
of the options like run etc say you need to put a link on
the desktop (then the link really does work.) I can
double click programs or settings and get a separate
window menu where I can use the links there...but the
whole thing has just quit working regularly after i have
been in windows for longer than 30 minutes...when i first
boot up it does work, but quickly degenerates.

It seems like my permissions have been separated and the
start menu can't access some of the links (just a
guess)...i am on the owner-administrator account...only
one account, and guest is turned off. I don't have a
virus, updated and checked with pc-cillin.