1) What software application is running on Windows Background?
Reason: Loading too many application on Win Background yends to use a lot of memories. Got to try disabling some of the Software to load at startup.
2) IE got problem. Suspect some software is crashing with IE
3) Try using blank web adress, if still cannot, re-install IE.
4) Go windows Update.
Hope this helps.

P/S: backup yr data before troubleshoot.