Saw this if it helps.
I take it you are using Internet Explorer?
A couple of things to try:
In IE go to Tools > Internet Options > Advanced Tab. Scroll down to the "Browsing" section. Remove the check mark beside "Display a notification about every script error" and put a check mark beside "Disable script debugging". Click OK.
If you have Internet Explorer 7 (has tabs), then go > Tools > Internet Options > Browsing History > Delete button. Then click delete "Temporary Internet Files".
If you have Internet Explorer 6, then go > Tools > Internet Options > General Tab. Under the Temporary Internet Files section, click delete files and OK.