If you're comfortable with your computer, you can search through the forums for how to get the 2.3 update and load it manually. Look for posts that talk about the update freezing; other key words could be ODIN and apk.
You might also consider going root. It's not a bad option, but it's not for everyone.
And then there's the backup/factory reset option.
Me - I'm still running 2.1. My phone froze up every time Verizon pushed the 2.2 and 2.3 updates. But mine still works okay, so I'm not messing with it at the moment. I have considered doing a total backup, then telling Verizon the phone is gimped (because it won't receive and install the updates) and getting another one but with all updates already installed.
The Fascinate phone really isn't a bad piece of work as a rule. But with Verizon's bloatware, updates that might not set well with apps you have installed, apps fighting with each other, and "clever" pieces of web scripts scattered all over everywhere, it can get so full of junk that it's like trying to tow a yacht down the freeway with a Toyota Camry.