I would need to know more - what's your data acquisition device, and what does your worksheet do?
Are you running DASYLab V7.00.05? If now, download it from www.dasylab.com.
The best way to get support for this type of problem is to go to www.dasylab.com and fill out the support form.
Measurement Computing (MCC) has free technical support. Visit
www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.