Baldurs Gate - Throne of Bhaal troubles

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ok ive installed the legit copy of BG2 from my CD and then used the BUGHUNTER's NO-CD crack so i could play multiplayer,
now i've bought Throne of Bhaal (again legit) but it won't detect that i have BG2 installed so i can't even install it??

it's always been a bit screwy in that the autorun never worked for me 'cause it couldn't detect an installed BG2 either so i had to run bgmain.exe to play it.

anyone had the same problem or ANY ideas??
cheers,
borinscary