HI, this has little to do with a Geforce warning but I have been able to reproduce the hesitation thing on machines , I think it has to do with bottlenecks in IO transtransferes.
If you have tried all the vid stuff to no avail the problem might lie with the HD
It could be that the HD is getting old and worn out or is really full or very fragmented . Try defragging or freeing up some drive space .
A couple of other thoughts,
check mobo drivers
winodws loading incorrect mobo drivers :
Not very common anymore but windows use to ( not sure about 2000/nt , W98 definitely does ) not load some manufacturers drivers correctly (especially in cases of nonintel stuff like the AMD 751chipset) . Normally, using the 'wrong'drivers, everything will work O.K. except the system IO stuff can get laggy (hesitates or jerks occasionally).
BAd ram :
could have a fault in the ram causing swapfile/cd access more often than is otherwise neccesary.
Winodws might be memory horking , you can get a memory utility to free up windows memory from :
www.majorgeeks.com
you can also get a cd/hd speed tester, and ram checker there
the last thing I can think of that would hiccup the system is a joystick polling from the pci bus ( all the old joysticks that connect to the sound card ) if you are using one of the "old" joysticks try removing it and running TrGlidos.
But to be honest I think that the problem may have something to do with the way glidos handles texture managment as I have seen it on machines using a 100FSB but not on faster FSB (133 or over) machines, though faster machines seem to have a lag in the usb controller response time so again I suspect some io polling issue)
(ps. a good virtual cd dvd utility can be found here : http://www.gotogs.com/products/CGV50.htm
free for thirty days 😉 , it lets you set the drive letter to whatever you want)
hope that helps