In that case the only other thing that is remaining is the Memory.
Since you are running a 64 bit OS on only 2 GB of ram it is possible that windows is not allocating memory properly, both system memory and GPU memory.

That GPU in the laptop only has 256MB of onboard memory, and the rest is shared with system RAM.

I would advise that you flash to a new BIOS:
http://support.ts.fujitsu.com/Downlo...,%20etc.)_True
and clean re-install windows 7 32 bit:Clean Reinstall - Factory OEM Windows 7

On a note regarding the re-install, if you do not have a windows 7 COA on you laptop, then you will need to get the windows key from running the Belarc Advisor, under Software Licenses, copy the "Microsoft - Windows 7" key, and use it when reinstalling.