I had Windows XP installed in my computer and Old 98 fiiles remain on hard drive. Can I remove them without messing up windos XP?

That would depend on what type of installation you did when you put XP on the system. If you did an upgrade, you probably shouldn't mess with any of the old system files, but if you did a full install of XP and old files remained somehow, it would be safe to delete them.

Doing a reformat and full installation of XP is the recommended method, because errors/problems/inconsistencies that might have existed in your 98 setup could be "inherited" by XP if you only do an upgrade.

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