I suggest:

  1. Disable System Restore on Windows XP: http://support.microsoft.com/default.aspx?scid=kb;[LN];310405
  2. Clean your temporary files.
  3. Use on-line scanners to full computer scanning: Kaspersky (the best!), Trendmicro housecall and/or Ewido
  4. It will be good if you download, install, update and run other trojan remover tools: a-squared, Free AVG Antispyware, SUPERantispyware and Spyware Terminator.
  5. Maybe you can google to know if there is any specific removal tool for this nasty :stuck_out_tongue: