Hello I installed Kaspersky in my PC but I no longer uninstalled I see anytime I open the browser Firefox likely a black screen covering the page but it vanishes as just as the browser full-opened, so what's this by God ? It is the first time I have seen Before I installed the Kaspersky antivirus it didn't appear. I thought it is a matter of protection But after uninstalling Kaspersky ( antivirus ) the black screen is still seen  ??