First try this.... from your Safari menu choose "Reset Safari".
If that doesn't do it, try
Safe Mode (It will take more time to startup in Safe Mode because it runs a directory check.)
If your browser functions correctly that way, go to System Preferences >> Accounts >>
Login Items, and remove them. Boot normally and test. If not go to Users/(yourname)/Library
/Contextual Menu Items and move whatever is there to the desktop. Then do the same with /Library/
Contextual Menu Items. Lastly, try moving ~(yourHome)/Library/
Fonts to your desktop and restarting.
Log out/in or restart, if that sorts it start putting items back one at a time until you find the culprit.
-mj
