You need more RAM but 98SE runs better with MB max. There are several links via other threads to Microsoft data base that explains why going higher can cause conflicts.
You need to ensure only progs you want are running by doing the following
type msconfig into the box, and click run.
click on the startup tab
uncheck those programs that are starting up on boot up that you don't need, e.g. office find fast and others.
save and exit.
check to see how much resource released.
You will still need to get 512 Mb into the system though especially if looking to play with photo's.
XP will allow more RAM to be fitted but you will still needs more that 256 for decent performance.