I am seeking help with a vexing problem; here is the background and the 
symptoms:

The system is "white box" Pentium 4, 80 GB HDD (50 GB free, recently scanned 
and defragged), 2 x 512 MB memory, Win XP Pro w/SP-2, completely up-to-date 
with all Microsoft critical updates, all of the usual firewall, 
anti-virus/anti-spy/anti-spam, all up-to-date, and all recently run in 
"safe" mode.

The system has begun to slow down considerably, which is most noticable when 
web pages are loading (I use RoadRunner, and have checked the connection 
with good results), and when the screen saver is running - - the pages are 
quite "jerky" as they populate the screen.

Last November, the power supply was replaced, as was the case cooling fan. 
A week ago, the system would not boot; the corrective action I took then was 
to turn it off for awhile (it stays on all of the time), then boot it to 
"Safe" mode, run all of the diagnostics, after which all seemed "right", 
except for the slowness I am now reporting.

After ruling out all software issues I know to rule out, I now suspect 
either the video controller or the disk controller, but cannot verify or 
validate either and am seeking held to diagnose these devices.

Thanks in advance for your (collective) attention to this issue. 

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