The last thing you need to do is reinstall Vista. Don't do it.
Before even considering this be sure you have everything you need backed up
to something other than your raid array, think DVD.
The memory problem is, surprise, NOT due to Vista (and I despise Vista). The
problem is your motherboard, which does not support 4gbs of ram, despite the
specs, or the particular type of ram you have--there are differences in the
structure of RAM sticks that go beyond the basic labelling of type and
speed. There is nothing you can do about this, particularly considering the
age of your hardware (ancient by current standards, sorry to say). Your
hardware lives in a 2gb world and there is nothing you can do about it.
In truth, despite Microsoft's spin about Vista supporting 3gb of RAM there
is no measurable difference in performance beyond 2 gbs in 32 bit OSes and
since Vista 64 is even less stable/usable than Vista 32 . . .
If you can boot your system and it will run stably with 2 gbs of RAM and the
8800 card then that is the best you can do. For a single core Pentium 4 that
is pretty much maximum performance. That CPU will actually hold back
performance of the 8800 video card.
I would strongly consider updating your motherboard and CPU to a dual/quad
core system with the appropriate type of RAM.
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