Avast anti-virus troubleshooting
If you have Avast installed when you try to install or upgrade Ace Payroll, Avast may wrongly identify the Ace Payroll software as a threat and quarantine it.
The solution is to temporarily disable Avast’s shields while you finish the installation. The instructions below explain how to do this for CD and downloaded installations and upgrades.
Disabling Avast Shields during Ace Payroll installation and upgrades