Some anti-viruses slow down strongly the access to WinEUR Payroll.
Indeed, they inspect each opening and writing of files, which causes performance problems in the use of WinEUR software.
You will find below, a file with the complete list of WinEUR Payroll executables.
If your anti-virus software, such as ESET, does not allow to add a whole directory as scan exclusion, you will have to add the process list in the settings.
List of WinEUR Payroll executables :
Here is an example of a correct configuration for ESET anti-virus ( X:\ being the WinEUR Salaries network directory):