Wilsondb

I am facing a problem with sync of midi in the Cubase. During the session in the Cubase the midi programming suffers one continues and constant delay (in such way with virtual or external midi).
Soon that I open a project and start to program midi the monitoring of that I am programming is normal and correct but after a certain time, when I go to hear what was programmed I verify that it is with a certain delay and this delay is continuously bigger.
I go in Devices and I give one reset in Windows midi item and all return to the normal status, but after a certain time (2 min + -) the delay goes perceptivel. the Windows midi reset restore all to normal (BUT I HAVE TO RESET EVERY 2 MIN, because the delaying process is continuos) .
The interesting one is that when I am playing the monitoring is correct but when listening everything suffers a delay who with the time goes increasing gradually and constantly.
I am using the m0 or m3 sync modes, the others crash the program.
I am noticing this problem also in other program that uses midi as the Finale. What´s happening? Please Help me, I am tired of reseting the midi every time .
(excuses my english)

Athlon 64 3200 - A8n Sli De luxe - 1gig ram - Audigy Platinum - Cubase SX3