iexplore program has performed an illegal operation

[csx train]

first time user
quiet frequently my old computer (windows 98 se) shows iexplore has performed an illegal operation.
invalid fault in module url mon.dll at 0167=77065552.
internet explorer Q891781

[YarrOfDoom]

I don't know what the problem is, but what always helps is to install Firefox and dump IE.