Our store has two computers which run on the same wifi network. All websites except google, gmail, youtube and facebook work fine. When trying to access www.youtube.com a pop appears, "your flashplayer is outdated please update." When connecting a phone or tablet to the wifi network the same thing happens.
I have reset the router and put in the settings again
The one computer runs xp with avg installed
The other computer runs windows 7 with malwarebytes and norton
Any help will be appreciated.