drevl182

I also had the same install error with the vcredist. I found that it was caused by my Windows Modual Installer was disabled in the Windows services list. I initally disabled it because the Trustedinstaller.exe was always running taking up 50% cpu. I only set it to automatic and start it when i manually update(it's the only way windows update will work properly). So try opening task manager, choose the services tab, click on the services button in the lower right, scroll down toll u see Windows Modual Installer, right click on it and hit properties, set it to automatic, and hit the start button, then apply and close it out. Halo 2 should install now. At least it did for me.

Im running Vista Ultimate, P4D 3.2 C1, 2gig ram, ATI 1950 XT. all updated drivers.

Hope this helpd!