I recently had a problem with my computer running windows 2000pro concerning pop ups. Trying to solve that, one suggested that I use this tool: LSPfix http://www.cexx.org/lspfix.htm
on 'rnr20.dll' which I did. I also used tried to repair internet explorer using http://www.mvps.org/sramesh2k/IEFIX.htm
. One of those two steps caused the computer not to be able to resolve names, for example www.yahoo.com
comes out as DNS error while if I do nslookup, it is able to contact yahoo.