(Tested on windows XP SP3)

1. Start
2. Click on "Run"
3. Type notepad
4. Paste the following line (This will imediately restart your pc)
%windir%\System32\shutdown.exe -r -f -t 00
5. You can set the time by changing the last value "00", for eg 05 will restart the pc after 5 sec.
6. Save the file will .bat extension.