If you uninstall PowerBuilder first, and then uninstall the PowerServer product, the Avast anti-virus software will scan files during the PowerServer component uninstall process. When Avast completes the file scan (which takes about 15 seconds) it will automatically close any prompts or dialogs it displays and the uninstall process will continue without being affected by the file scan.
If you do not want the Avast scan process to appear, you can disable the Avast anti-virus software before uninstalling the PowerServer product.
