Hi, i have "classic" problem.
When i am trying to "save" or "save as"  SIMS 3, Error 12 will appear. I can only  save the game  once - tree times (sometime) I guess that is memory problem,
(Low system memory) but what i tested it is not. I disabled Virtual Memory so program was force to use RAM.I had only 1,5 GB of RAM full 1,75 GB was free.
So no problem with full RAM.

I enabled Virtual memory and tryed different values, but without effect.
I set .exe file to use more than 2GB RAM, but without effect.
I also deleted Save Games,Cache ets. withou effect.
 

-In description "World was built on an average PC, 2.4GHz Intel Core2 Duo, 2GB RAM. It should be playable on the average PC."

So my HW should by ok.

-Can anybody tell why this Error 12 will appear and how to fix it? I can not play this neiborhood and some peope can, so there have to
be solution. It si really disappointing that i can not play this  neiborhood or any big neirborhood.

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My HW and mods:
Intel Core 2 Duo E8400 3,00 GHz
Nvidia GTX 260 896MB, Driver Version 285.58
4 GB RAM ( i have 32-Bit system so i can use 3,25 GB)
Windows XP  SP3 32-bit
--------------------
Mods:C:\Documents and Settings\Keyz\Dokumenty\Electronic Arts\The Sims 3\Mods\Packages
awesome.package
aweconf.package
velocitygrass_only_important_memories.package
NoBuildSparkles.package
nointro.package
-----------------------------
+UnionCove ( installed via Sim 3 launcher.)

Downloader from:
http://www.carls-sims-3-guide.com/unioncove/

Sorry for Necromancy but it is important for me.

Edit.: I Solved problem with /3GB /USERVA=2800