How can I go back to the normal megaman?

I assume you tainted your Megaman with dark chips. Well it's kindof tough. First you need 100 standard chips. Then you must ebat the game. Then once you've done that and you've watched the entire credits click continue. You should ahve a colonel/Protoman head icon. Then in Undernet three take the northmost path back to Undernet 2. You'll find a golden program. Talk to him and let him open a portal to the Nebula Area. Go through it and beat the Liberation mission for the Justice one J chip. Then go to Higsby's base, jack in to the hidden computer and trade the chip for a Soul Cleanser program. Put it in your Navi Cust and voila. Megaman will be normal again!

Or If you havent beaten it, if you stop using the darkchips, the darkness will eventually subside. You can use the for soul unison, but only that. Using them as attacks will retaint Mega.

If you stop using darkchips megaman will eventually turn back to normal (depending on how much you use dark chips this may take a while). Once normal you can double soul with the darkchips to get darksouls or chaosunisions, a charge attack will use the darkchip without tainting your navi. There are pluses to having darkmega, you can use certain chips that a normal navi couldnt use, darkmega goes beserk when at 1 hp, bugs can be stopped by an antibug navicust program you get (can't remember exactaly where to get it, it is a place where a liberation was, a program dealer, I think, don't complain if I'm wrong), and when darkmega goes beserk he can use every battle chip in your library.

Just don't use Dark Chips.. OR Choas Union. ( Dark Sword Cross fusion