Which notes similar problems other users of IE9 ( and IE8 in one case ) are experiencing.
If your using IE9RC ( its only a release candidate at moment, so everyone who's using it are testing for Microsoft!!!, so no official support yet!!! ), you may want o uninstall like the gentleman suggest in above thread and see if problems persist when previous version of IE is re-installed when you uninstall IE9RC.
Give it a go and let us know what happens, good luck :-)