New OS questions

[whoreable]

yes. just make sure you use a good key so u can install sp1

You might be able to "upgrade" from win98. but I would instaed format and clean everything off before reinstalling, it would make for a much better longer lasting install.

as long as you dont do something stupid like accidentaly format the wrong drive it should be fine, maybe consider unplugging the ide cable during install to avoid confusion.

xp will most likely be compatialbe with your programs. I dont know waht mugen is but emulators work fine on xp.