Why hasn't Microsoft acknowledged and/or fixed the iexplore.exe virus?

After cold booting my Toshiba Satellite laptop with Vista, Task Manager's Processes pane will show no instances of iexplore.exe. However, after using the computer for a while (using Outlook, Crome, Excel etc.) my system slowly grinds almost to a halt as multiple instances of iexplore.exe appear in the Processes pane, each consuming 15 to 25% of the total CPU cycles. This gets worse and worse until the system become unusable.I am one of many thousands of Windows users who is plagued by the iexplore.exe virus. I've used 5 different malware/virus removers (including MS Security Essentials and MSERT.exe) but they don't solve this problem. Why hasn't Microsoft acknowledged this dangerous virus and done something to remove it? (MSERT.EXE does not help). The only users I have found on the web who have rid themselves of this nasty virus are those who reformatted their hard drives. Surely Microsoft can do better than that. Has anyone found a fix that actually works? (Many of the suggested fixes on the net "seem" to work for a few hours or day or two but then the virus pops back up again and consumes most or all of the CPU cycles).I'm amazed that Microsoft do not have a solution for the problem. If you have a fix that really works, please let me know. Thank you.

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