make sure that iis has the same version of asp.net as yer vs does.
are you running it against a database? did you stick a config file in the same directory for debuggin?
the iis on a winxp cd is usually asp 1.0, current (up to date) asp.net is like 1.1 i believe so you need to check if they match up or not, just google iis upgrade 1.0