Yeah it's likely the PC then. I'm using a Dell OptiPlex 9020 which is running Win 10 Pro on a i7-4770 and 8gigs of RAM. It's only being used for BI so it has no issues with running all my cameras with no hiccups.
Try this which I grabbed from here Trouble Shooting Issues
Forget the password
If you forget your password, hold down the reset button for 10 seconds. This will default the camera which will require you to delete it off your account to reconfigure the camera. The password will default back to...
I've read a lot about Sentry over the past weeks and am interested but I want the dog/cats to keep alerting me. Also I don't believe they can detect vehicles yet which is also why I'm still sticking with the BI for motion alerts for now.