Antivirus Options
You should be using an antivirus program on your point of sale system. If you get a computer from us, we will preload Microsoft's free Security Essentials program onto it for you. This is an acceptable lightweight protection program.
If you're wanting to get something a little more robust, we have typically seen less problems with Norton products than most other security software. Regardless, particularly for multistation setups, you may need to do some configuration to allow for proper operation of the software - on the server computer, in particular, access must be allow to SQL server from external devices.
Regardless of what path you go for antivirus protection, the best things you can do for the safety of your data are outside of the antivirus - have regular backups, off of the system, to recover from the worst case, and don't run unauthorized programs. This latter can be a matter of training and policy with employees.
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