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PC Clock problem.

Hi Guys,
             Has anyone experienced problems with the PC clock 
losing time when running WiSP?   I have an experimental second 
station running WiSP round the clock and am dogged with an 
intermittent slow running clock problem.   All seems to be well for a 
period -  2 to 3 weeks on occasions - and then for some reason the 
PC clock starts to lose; and I mean lose!    14 secs per minute on 
one occasion! (Measured by opening up the Windows clock which 
is no mean feat as the mouse pointer has a mind of its own - no 
doubt a spin off of the timing problem.)   Since removing every 
vestage of the loaded WiSP prog. two weeks ago and reloading 
with the latest version downloaded on the same day, it has 
behaved itself. On checking this morning the PC had lost just over 
4 minutes since last nights passes of KO-25 and UO-22 - which it 
ran properly . UO-22 is set to update the clock incidently but as it 
had lost so much overnight it failed to do so during this mornings 
early passes. Assuming that the clock was corrected on the last 
pass last night it suffered its 4 minute loss in the space of about 10 
hrs.   Quite mild compared to previous losses but more that 
enough to screw up the project!
    On shutting the PC down and re booting the PC time corrects 
itself and away we go again - but for how long?   The PC's only 1 
year old - Pentium 3 and is running Windows 98. It is dedicated to 
the sat. station - no junk software.   It is LAN connected but the 
problem comes up both with and without the LAN plugged in the 
wall.      Incidently, prior to the reload a different mother board was 
installed just to be sure.    
   Anyone had the problem?  Alternatively, can anyone tell me how 
I can identify what's 'preoccupying' the clock - or whatever?   
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