How to overcome zero offset before integration to get velocity

[Desesperado]

Hi I retrieve acceleration signal from a PCB sensor with a NI DAQCard and try to integrate numerically the signal using the vi routine that LabView has to integrate but I get a lot of clearly spurious low frequency peaks. How can I get rid off this problem? I would like to keep the concept of integrating within the program instead of using an external integrator circuit. Is there a vi that performs this job beter than the one in LabView or is there a procedure in mi own vi to overcome the integration of a zero offset drift?
Thanks