If 1.05 ran okay, then what version are you haveing trouble with, one of the tweak packs?
BTW you only need the latest patch 1.05, no need to install the others first.
hmm rereading it sounds like this is a save game problem, open the save and look for the line number that the error occured and see what is wrong. If you do not know ask in the editing forum and the guys there can help. If you do not have a text editor that can display what line you are on ask there as well for a good freeware one, there are several available.
BTW you only need the latest patch 1.05, no need to install the others first.
hmm rereading it sounds like this is a save game problem, open the save and look for the line number that the error occured and see what is wrong. If you do not know ask in the editing forum and the guys there can help. If you do not have a text editor that can display what line you are on ask there as well for a good freeware one, there are several available.