I think that you are mistaken something, I could'n find pvm900 at viaarena, no results at all.
If you use SP2 upgrade pack...well don't, some old peripherials refuse to work with the upgrade pack, instead install from full OEM cd or stick to SP1, I have some customers that still work with win98 and xp SP1 very well.
Try this: first update your DirectX software from microsoft, link: http://www.microsoft.com/downloads/details.aspx?FamilyId=2DA43D38-DB71-4C1B-BC6A-9B6652CD92A3&displaylang=en
Hope you are a genuine windows user because you need to be to get it, download and install.
If it did not solve the problem...enter windows in "safe mode" (F8 while loading computer), press "yes" to the question asked,
start-->control panel-->system-->hardware-->device manager-->open the + at the "display adapters" right click over the display and choose uninstall, do the same at "sound,video and mult..."
log off while shutting down the computer, turn on, windows will prompt for the device driver (once for display and once for sound), point to place where the display or sound card drivers are, if there are not recognized as valid drivers, maybe they are not compatible with OS, search for compatible soft at driverguide.com