Can't Exit ITUNES 7.7 update

Has anyone had this problem and found a resolve? Since updating to ITUNES 7.7 I have been unable to exit ITUNES except via ctr-alt-del, Task Manager, End Task. Pressing the “ X” button or going to Files- Exit freezes all controls, though the cursor continues to move normally. 1) I did a clean uninstall through Control Panel of ITUNES and also QuickTime then reinstalled from a fresh download of 7.7 – same problem continued. 2) I did a Windows Repair of ITUNES through Control Panel – problem continued. 3) I ran the ITUNES diagnosis option on ITUNES – no problem found but this problem continued. 4) I reinstalled on top of 7.7 – problem continues. 5) I submitted a bug report but to Support but no answer from Apple. Thank you for any constructive potential solutions.