As mentioned, a good firewall, when set up correctly, will prevent such attacks. Also, you still haven't mentioned what script(s) you are using, or if you've tried removing them to see if that's what the problem is. Why? That could easily be where you're having issues, but you seem to be ignoring it.
Also, as we've mentioned, use more than just an antivirus program. Antivirus programs aren't designed for trojans and other malware. Yes, they can find a lot, but that's not their real purpose. That is why it's important to use anti-trojan and anti-spyware software as well as your antivirus program. Good ones are Spybot: Search & Destroy, Ad-Aware, and Hijackthis (for IE hijackers). There are others as well that you can try. Be aware that such programs find many things that *could* be bad, but aren't necessarily bad. So don't just delete everything that those programs list (mainly in reference to Spybot and Hijackthis). If you don't know if it should be there, ask before removing it. And, for Spybot, set it so it makes a backup in case something gets messed up, so you can return to what you had before removing things.
Basically, you have a choice. You came here asking for help. We've told you who to contact. Have you contacted those that were mentioned? We told you what protection programs to run. Have you done so? We've given you the help you asked for, but it seems as though you're ignoring it rather than trying it.
