Is Shivering Isle installed? If si is not installed properly then usip will not start correctly and ctd because it is missing si resources from oblivion.esm
To check make sure that Oblivion.esm this size 271,001 kb ( or around that ) ..if so then SI installed correctly..if around 240,000 kb then SI did not install correctly..Reinstall SI..
Did you install the patch correctly also..
Meaning that you installed in this order oblivion, shiveringisle, official patch 1.2.0416 for SI, no error message..
Are you loading dlcshiveringisle.esp also then usip in load order
Some things to check..
Yes, it's installed. There was absolutely no error message during the SI installation, nor during the official patch or unofficial ones process.
But Oblivion.esm is around 240,000 kb.
Installed according to the readme.
Yes, I'm loading them like this.
You have too many plugin files in your Data folder. I forget exactly where the limit is, but you need to move the ones you don't really need out of the way. Obviously keep the USIP and the other unofficial patches where they belong, but anything else you've unpacked there and aren't using needs to move aside.
There weren't that many plugins when I was trying it in one case. I remember some time ago I was running Oblivion with loads of mods, and therefore plugin files, and it was working fine.