Aww shucks. Thanks Shegeek.
Good to see you've been able to solve the problem. nothing worse that cracking your head against a nasty that crops up and stops you playing one of your favourite games. And well done you for working it out. There is no replacement for reading and researching when it comes to this sort of thing. In almost every case someone somewhere has come across your problem before and written about it on the innernet.
The box says 2GB but that doesn't count having a mods file or multi-installs. It will depend on what mods you use. IIRC GWX in the MODS folder will add at least 1GB once its there in all its glory.