How long have you waited for them to finish?
- It's not uncommon for installers to hang and then suddenly leap to finished or near finished on weaker systems. If you're assuming they're frozen quickly then it could be that they just hung and aren't displaying their progress results to you.
Are you running anything in the background?
- I have Titan's Quest (and Immortal Throne) as well as TES4: Oblivion installed on my PC so I know they install just fine. Could there be anything else running that might interfere with the installation?
Have you tried going right to the CD/DVDs and running the setup/autorun files with the "Run as Administrator" option?
- It could be that you lack sufficient permissions for them to install. I don't recall doing this with my games but it's worth a shot.
Did you cancel an installation and leave partial files out there?
- This may or may not matter but if you cancelled the installations I'd suggest checking to see what did get installed and copied to your HDD. I'd also suggest removing that before trying the next install.