Removal

Use the Control Panel's Add/Remove Programs entry for 'RapidBlaster' if it is there, then go to the Downloaded Program Files folder inside the Windows folder, right-click the 'AInst' item and 'Remove' it.

(If the AInst control is not removed, any web page will be able to reinstall Rapid Blaster. It is this installer control that is detected by the script at this page.)

After restarting, you can clear up by deleting the 'RapidBlaster' folder inside Program Files, and deleting the key 'HKEY_LOCAL_MACHINE\Software\RapidBlaster' from the registry (Start->Run->regedit).
source http://allentech.net/parasite/RapidBlaster.html
As stated on the web site