do a "find files or folders" for *sex*. also do a reg search for sex.
when you find a file with this word, open the directory is in and see what else is there alse look in its sub directories.

a list of the services running on your computer...and a netstat might show something. as nebulus200 pointed out this has to do with dns. if "net use" can not find its target you'll get an error 53. not that this is the case but there's a few worms that use net use in batch files to spread