"DSETUP.dll file missing" error

[Village Idiot]

I have not played P99 in quite a while, but apparently my Antivirus removed this file I am guessing from my older PC, have been trying to log on but keep getting DSETUP.dll is missing. Not sure how to correct this problem other than reinstalling the game but the Titanium edition I have disc one won't install (on a different PC) due to severe scratches on it after letting a friend use it to install game. Any help would be greatly appreciated. I use Windows 7 on the PC I am trying to run game on.