IE7 "this window is busy"

i keep getting this problem in IE7.
when im trying to access a link, it just says "waiting for http:\\...." in the status bar and nothing happens.
i have no choice but to close the window, and then i get a "this window is busy" error (see image below) - which i click OK to.

http://www.codeattest.com/blogs/martin/busy%20window.png

does anyone else get this? is it just with IE7? how do i fix it?

thanks

Try disabling the add-ons, then put them back, one at a time until you find the offender.