What do you mean it 'crashes'? It actually, on its own, quits? Or it says its 'not reponding' and you close it down yourself?
Another reason for the crash might be that you installed the game to the default Program Files directory.
If you have Vista or Windows7, AND you installed your game in the default directory, then you will never see the mod in the data folder.
The CS is NOT part of the game so the OS sees it as a virus or trojan program trying to change Oblivion game files. This is not allowed by the OS.
Solution? Pick "one" of these:
1. Install your game to your Root C: drive. Like C:\Games\Oblivion\ or another drive entirely if you have one.
2. Remove the security from your OS and then you can join the XP computer ranks and become a Zombie computer. *Not recommended.
3. In your \Oblivion\Data\ folder, look at the top right. There should be a button called 'Compatibility Files'. Click that to find your mod. You can then copy it from there to your Data folder.
4. Run the CS in Administrator mode. Right-click on the icon and select, Run as Administrator.
by crashing i mean that it shuts itself down, saying that it has stopped working. I have installed the game onto an external hard drive if that helps any.
Crashing on save is also known to occur if you have a master loaded (other than Oblivion.esm) that contains land edits. You can prevent it by making a tiny dent in the landscape before your first save, and removing the edit when you're done working on the plugin. Some people also get crashing on save if they are starting a new plugin, and don't make the first initial save before making edits. So, to get around that, you just save right off the bat, and then start work.
This may not be your culprit, of course - just make sure that there's no other cause of your crashing before you assume it's related to the OS, to save yourself some hassle.
The only things that i have loaded are the GOTY files of Oblivion, KOTN, and SI.