cfitz, I found the Ahead key in regedit but that was there because I had installed InCD and Nero Media Player which had no problems. Anyways, I uninstalled InCD and Nero Media Player from Add/Remove and deleted the ahead key in the registry. It's still not letting me install Nero.
You mentioned uninstalling Nero from Add/Remove, but this is a new installation of XP and it only recognizes installed programs as the ones which I installed after this new installation.
I was guessing that some of Nero's files in my C:\WINDOWS folder which I'm not using any more might be causing the problem. I got rid of that folder from my C: and put it on another drive just in case I need it later (i wont though). I still can't install Nero.
Here are some more details as to the installation problem -
I click on install Nero and it says Checking Windows Installer and then it says Older version of Nero found click Remove to remove Nero from your computer. After removal this program will no longer be available for use. I click Remove and it says the wizard was interrupted before Nero could be completely installed. Your system has not been modified. To complete installation at another time, please run setup again. Click finish to exit the wizard.
I had the latest version of Nero installed using updates which was 184.108.40.206. I am not sure which version is on the CD. On the CD however, it says where the serial number of the disc is : nero 220.127.116.11C.
I don't know how it is able to find a previous version of Nero when my whole registry is new(isn't it? it's a new installation!?!?)
I didn't even get a serial number of nero so that I could have used it's demo version and then made it full. Well, the serial number isn't a problem
but do you think I should try and download their demo and see if it gives a similar error? I really don't want to screw up more things.