Pos3/5/FNB: Error 1001 on re-installation
When I re-Install POS/F&B the system comes out the following message:
(Error 1001. The specified service already exists)
Uninstall process may not have completed and POS services were not removed properly.
Remove the services using command prompt.
1.Go to Windows start > type the keyword = 'services' > click on Services
2.Look for POS sync service.
POS3 – APOSSyncClientServices
POS5 – APOSClientSyncServices
FNB – AFnBClientSyncServices
3.Having identify the services, go to Windows start > type in ‘cmd’ > right click on Command Prompt > Run as administrator
4.Click on Yes
5.Then type in ‘sc delete <ServiceName>’ as shown below.
By: CK 20201126, Jacky 20210125, P210125 
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