iexplore.exe

I hope someone can help and tell me if I have a trojan or not. I have a one
year old computer and am careful with virus etc, always running Norton, but
for the past couple of weeks especially on a Sunday/Monday my cpu has been
running at 98% on iexplore.exe I have done a scan and even paid money for
norton to remotely sort it, only they couldn't gain access and only caused
explorer to close..... I have read the threads and have just finished a
search and found iexplore in loads of places, including system 32. If
someone tells me how, I can copy the information. Or is it just that my
computer is trying to do loads up updates and getting stuck? Please someone
help. Thanks
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norfolkg