I downloaded a file and a box came up and said "open with". I clicked on Paint, and didn't realize the the box was checked underneath that said from now on open all  with this ...ect...ect.... Now I can''t open anything. How do I change this. where do I find the box to unclick it. I have windows 98SE

   Our registry cleaner, RegVac Registry Cleaner (http://superwin.com/regvac.htm), has an OpenWith Editor in the Expert Zone.  It can undo associations.  It will list them all, select the extensions that you do not want to be OpenWith-ed and click on the Undo Association button.  Hopefully, that will fix your problem.  You can use the Trial version if you have not purchased it.
   If you want another program to be associated with those file types, running that program, may fix that.