Whenever I try to start a new mod with the construction set my CS crashes. People have told me to reinstall everything under games instead of program files. I have done that. People have told me to save before making any changes. I do that. I have done these things but the CS still crashes everytime I try to start a new plugin. Any Ideas?

Ideas?
1. Are you first loading the Oblivion.esm?
2. Are you trying to save the mod 'anywhere' other than the folder path in the games 'Data' folder?
3. What version of game and CS are you using. We need to know exactly...

I had the same problem. Get the CS Extended. You can find it on Nexus and in the mod sub-forum. It solves the problem beautifully, and adds some other useful options while at it.

I am first loading both the oblivion master file and the two expansions and I am selecting none of them as an active file. I am attempting to save in the data folder. The Construction set is v. 1.2.0.404. Oblivion is v. 1.2.0.416.

Seems I got awesomely ignored (or you are of those rare types that dont fancy the obse much) but anyway, I'll just leave the direction here:
http://www.tesnexus.com/downloads/file.php?id=36370