How to remove virus detected in macbook air? **Urgent**

Try

1. Quit Safari

2. Safari menu > Develop > Empty Caches

If Develop menu is not available in Safari menu,

select Safari > Preferences... > Advanced > select Show Develop menu in menu bar

3. Restart Safari with the Shift key pressed.

ckuan's advise may temporarily work, but these fake Flash updates usually install adware. So, you'll continue to be bludgeoned with ads until you remove it.

Open Safari's preferences and look in the Extensions folder. Disable and remove any you don't recognize.

In the future, never, ever believe any site that says you need to install Flash, Java, a codec, or anything else it insists you install to use their site. It is a lie. Every - single - time. The one and only place to ever download Flash from is directly from Adobe.

at this time there are no virus for OS X reported by any credible securities lab.

you can check for adware and malware using malwarebytes for mac or etrecheck, and for futher analysis you may post an Etrecheck report.