1. Launch MCAffee Virus Scan console and double click on On-Access Scanner.
2. Click on Processes or Default Processes / Low Risk Processes and High Risk Processes depending on your options.
3. In the Exclusions tab, click on Exclusions.
4. Click on Add and select the Statistica temp file directory in the "By Name/location" section. If deemed necessary, also add the Statistica Installation folder
Alternatively/additionally, you may choose to make an exclusion by File type. Select File Type as STA (Statistica spreadsheet)
5. Click OK four times to close all open dialogs.