Memory

You aren't giving us a whole lot of information to go on, but here goes:

In general, increasing memory will not "damage" anything software related. In general, the more memory you have, the happier Windows is.

However, there is known problem with Windows 98 in that running more than 512MB makes Windows 98 very unhappy. This doesn't "damage" the OS, but Windows will either not operate properly, or will refuse to run, period.

There a couple of work-arounds available in the Microsoft Knowledgebase that may or may not work in a particular situation.

Common wisdom is to limit Windows 98 computers to 512MB.

Hope this answers your question.