After the RAM patch, the game can use up to 3.8 GB, not more, unaware of how many RAM you have (but obviously you need at least 4GB and more, because Windows will require some RAM too). Do not use U-Boot Interiors together with campaign files. Also if you stop using SH3 Commander you must first reset all values to default in the Commander and start the game a last time with it, in order to change the saves etc.
You guys seem to move files from left to right, up to down without thinking...
Tip: I think Microsoft still does offer for some bucks the "PC Administrator" diploma. It also makes a good figure to be used in a resume...