This is a fake “Flash Player Update” prompt. Simply ignore it.
Probably your computer is infected with an adware or PUPs. So don`t wait, perform a full scan of your PC with a good antispyware tool.
Myantispyware team
Author: Myantispyware team
Myantispyware is an information security website created in 2004. Our content is written in collaboration with Cyber Security specialists, IT experts, under the direction of Patrik Holder and Valeri Tchmych, founders of Myantispyware.com.