missing .dll's

I have written, his makes the third time asking for someone to desperately help me. My system says that I am missing some of my dll's. I am trying to install my scanner which was installed at one point before and it worked fine, but then I upgraded to win 98SE. I had so many problems with the SE, I talked to Microsoft and they said that may the best thing to to would be to reinstall windows 98. with 98SE, I could not get any of my USB devies to work my printer, DSL, scanner nothing. I finally did uninstall the SE and went back to the 98, I was finally able to get my priner working, but the DSL wuld not work, Bell South came out and as soon as he touched it it crashed, don't know what he did, I was just mad over that. Come to find out, when he crashed my system=, he reinstalled Windows but he insalled 95. He said he could not get hte DSL to work. So after a week after me fighting with them they sent someone back out, the secod guy couldn't do it, anoher came with him he got it working, but that still leaves my scanner, says it is installed, but when I click on o scan says i is warming up that''s as far as it goes, won't can. It says that the MAXKERNL.DLL is missing along with about 5 other .dll's, Please SOMEONEONE HELPS ME