The infection you have (a Look2Me/VX2 variant) isn't uncommon, but:
A) Due to differences in the underlying structures of Win 98 and Win 2000/XP, HijackThis doesn't give us many (if any) clues as to the exact names/locations of the infected files when used on a Win 98 system. This makes it harder to prescribe an exact fix.
B) The tools that we would normally use to detect and remove current versions of L2M/VX2 infections only work on Win 2000/XP systems.
Download, install, and run the trial version of Webroot's Spy Sweeper; it is compatible with Win 98, and others have had success using it to removing certain versions of the L2M infection.
Please read the Help documentation that gets installed with the program, as it has easy-to-follow instructions for configuring and running the program. You'll want to run as thorough a scan as possible, and post the Sweep Results here if you can.