Have you updated anything recently? You could always delete or roll back to last update to see if that cures it.
Trying the new IE9 might help iron out any possible bugs to?
John
"My lovely car now sold onto a very happy new owner. I still love this marque and I will still be around, preferred selling to breaking, as a great runner and performer"
Actually my son-in-law advised me not to upgrade to IE9 (don't know why though?) so I'll check with him for his reasons and may end up doing just that.