Error Number: 3 File is in use. Do c:\s_taxgaw\s_taxgaw.exe
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The "in use" error means the program is running in the background.
Open Task Manager (CTRL+ALT+DELETE).
Check for "S_TAXGAw" or "GA-Tax[Complete/Property/Sales]" in the Processes tab.
If found, select and "End Task."
Alternatively, restart your computer which will end background tasks.