You could try:
tools|customize|toolbars
and select each and click reset
or you could just blow away all of your toolbars and rebuild any customized
changes at your leisure.
If you want to try the second...
Close excel
windows start button|search/find
look for *.xlb
rename all of them *.xlbOLD
then reopen excel and test it out.
If it worked ok, search for *.xlbOLD and delete them.
If it didn't, rename them back to *.xlb.