windows reload problem

I have an old PC with win98 but runs very slowly. I try to update to win2000 but it restart several times and can't install completely. SO I reinstall the win 98 but I can't find my program in my new win 98(right now incompletewin2000 and win 98 installed in my PC).
Who can tell me how to uninstall the incomplete win 2000 or restore my program and file to my new win98? Thanks.