cant get on the internet

I cannot open internet explorer, I got an old IBM Thinkpad laptop from a
friend and it has windows 98. I installed AVG anti viris and it had 472
virises. It put them in to the viris vault and i deleted them. Downloaded
Ad-aware, ran it. MSM messenger works and AVG is getting the updates. But

can't get on the net. A window comes up and says

"Program not found"

Windows cannot find iexplore.exe

This program is needed for opening files of type 'Internet Explorer.'

I am going nuts trying to figure this out. Outlook doesn't work either

Can some one help me

Halo