It may be a virtual memory problem.
1. Clean up your hard drive. Delete any unneeded files.
a. Windows\Temp any file over 1 week old is not needed.
b. temporary internet files. These reside in different places for different browsers.
2. Scandisk and defrag!
3. Get Lavasofts adaware software, and check your system for spyware programs.
4. Reduce the number of programs that run in the background. Many programs place quick start icons in the system tray. Part of the programis always running. Close and dissable any that you don't take advantage of on a daily basis.
You can use msconfig to disable start-up programs.
5. Double your actual memory. W98 runs better with 128 - 196MB of ram.
6. Use a registry cleaner utility to clean out some of the garbage that builds up over time.
You can download Regclean form Microsoft, use Notron Win Doctor, or Ontrack Fix-It.
There are numerous other free-ware utilities, but I have not used them myself.
That should clean up your system and improve performance.