LE 7.3 Tempo problem

[TWil]

Hi all.
I've been running 7.0 and just got a Digi 003 obviously running 7.3. Its great, but whenever I put a click in the track or use an existing midi outline, the timing is absolutely terrible. It doesn't line up with the tempo. For example, the click plugin will be active and it will click once or twice here and there then quiet for a while, then a few fast clicks etc.
Does anyone have any idea why I might be having this frustrating problem?
Thanks in advance,

TWil

[spkguitar]

Do you have a dual-core or other multi-core processor? If so, have you installed the Microsoft Dual-core hotfix for Windows XP? There is a flaw in the operating system with regards to multi-core processors that screws up the MIDI clock and it's extremely important to update Windows if you have a processor with more than one core.