Regularly check your Windows Task Manager (press Ctrl+Alt+Delete and click "Start task manager") to ensure that there are no shady processes running when they shouldn't be.

Change the default password of the remote access software.

Update your computer regularly and use a good antivirus program, which will help keep sketchy programs (such as keyloggers) from being installed on your computer.

According to , 97 percent of data breaches are avoidable using simple measures, such as using firewalls on all Internet-connected services, changing default credentials, and monitoring third parties that manage your business's point-of-sale systems.

In other words, if there is remote access software installed on your point-of-sale computer because a third party needs to access it, it's very important to ensure that that third party also keeps its security up to par.