I have had no problems since loading the IE11 designed for Windows7 Premium. I have a Asusi7,8-core, computer from October 2010. I downloaded it the morning after they put it on-line.
I see the usual group of repliers pushing their favorite systems have come out of the wood-work.
I would re-install it making sure you pick the one for Windows7, 64bit.
Your computer could possibly have other problems. Have you checked your Windows updates to make sure none have failed? Also do a full scan to make sure there are not viruses.