If you installed through the Configurator, disable the V13 driver.
If you installed through the Add/Remove Programs, use Programs and Features/Uninstall to remove the Measurement Computing DASYLab driver.
Note that the V13 driver may have made a change that doesn't get uninstalled. You may need to call in for support to go back correctly.
Measurement Computing (MCC) has free technical support. Visit
www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.