'WARNING! Your Flash Player May Be Out Of Date' Pop-up

'WARNING! Your Flash Player May Be Out Of Date. Please Upgrade To Continue' Pop-up is a fraudulent pop-up alert that may be used to install a variety of PUPs (potentially unwanted programs) and adware threats on a computer system. 'WARNING! Your Flash Player May Be Out Of Date. Please Upgrade To Continue' Pop-up may also mean that the computer has been already contaminated with PC infections such as adware or potentially unwanted programs. The phony 'WARNING! Your Flash Player May Be Out Of Date. Please Upgrade To Continue' Pop-up may state that Flash Player may be out of date and urge a PC user to download and install the latest version of a Flash Player. If a computer user decides to download and install the said program by clicking the button in the bogus 'WARNING! Your Flash Player May Be Out Of Date. Please Upgrade To Continue' Pop-up notification, he may unknowingly permit to download and install more computer threats to the PC. The fictitious 'WARNING! Your Flash Player May Be Out Of Date. Please Upgrade To Continue' Pop-up message may emerge on popular Web browsers such as Mozilla Firefox, Google Chrome and Internet Explorer and other well-known Web browsers.