I doubt you will be able to access the parallel port that fast. At least LabVIEW on WinXP will not be accurate enough to acquire data that fast (and reliable). You still have PCs with 3GHz dual core processors and a parallel port?
Btw. Wikipedia and other sources will explain the different kinds/modes of parallel ports used in PCs. The "biggest" mode allows for transfers of up to 4MB/s, but I'm sure there are special drivers involved. But all those parallel ports are usually vanished in history superseded by USB...
Best regards, GerdW
CLAD, using 2009SP1 + LV2011SP1 (sometimes even LV2013) on WinXP+Win7+cRIO Kudos are welcome