How many DIMM slots you have occupied and available on this Intel MB?
How much reserve RAM does your Intel GMA G31's video/graphics GPU have? Card or Chipset?
So far, as I read your post, you seem to have, pretty successfully, so far, used a barebone PC for quite a bit of time.
I really do hope you can give us answers to these two main questions. I do guess that you've updated your drivers quite often enough, so far.
My desktop has been running very slow for the fast 2-3 months.I clean & defragment my hard drive, run MS Security Essentials, Keep my OS updated but still it is pretty slow.Booting takes 30~40 seconds and opening up an application take5`7 seconds.It is really annoying.
CPU: Intel Pentium Dual Core E2180@ 2.00Ghz X2
RAM: 1GB DDR2
GPU: Intel GMA G31
MB: Intel DG31PR
HDD: 160 GB Maxtor
OS: Genuine MS Windows XP SP3