It could be a result with IE6 with msn messenger and yahoo messenger also. I found when I did a reformat and installed yahoo messenger (newer version) and msn 6.1 I had a srious problem with the mouse or my system freezing. Try using older versions of the programs if this sounds familiar. Daniel
If you think the problem is related to a conflict between the two messenger programs, (certainly possible) you can switch to Trillian. Trillian allows you to connect to multiple messenger services, ie. Yahoo, AIM, ICQ, IRC, MSN...