Is there anything running in the background? When I work in my music I turn off my antivirus, anti-malwarebytes, and disable my Ethernet card via the device manager.
Did you disable your motherboard sound card? It is probably a Realtek sound card. Having it and your EVCA card on at the same time can cause problems. It did here with my Roland Octa-Capture.
Have you run a full check for viruses? This would include using these free programs along with your antivirus:
1-
https://www.bleepingcomputer.com/download/rkill/2-
https://www.bleepingcomputer.com/download/adwcleaner/3-
https://www.ccleaner.com/ccleanerRun in this order ccleaner, rkill, adwcleaner, your antivirus.
Good luck and I hope this helps.