start > run > msconfig
Have a look on the Services tab (tick the Hide All Microsoft services thing) and the Startup tab and clean out anything suspicious. Then reboot to see if it still does it. If it does;
start > run > regedit
ctrl+F
search for things like "attractive clock" or the name of the "company" that wrote it or whatever. If you come across stuff that's obviously to do with it, either clear or delete the keys and entries.