Problems wit PC

My PC has been performing very well until the last week or so.
The problems I am having when on the internet (I use Google Chrome):
1. Tabs keep opening independently on their own on the tab bar to the right. Usually relevant to some search I am doing or a tab I have opened. Often get ads from reimage repair and McAfee – they ask me to renew my subscription, I don’t have an account with them. Also fake Microsoft site telling me I have a virus and to phone them.
2. Annoying adverts come up on the right of my screen, also relevant to searches I am making or have made.
I have AVG protection. Any suggestions would be useful.

Hello David,

I am sorry to hear this. To fix this issue, I request you to get our additional support help for which have sent the email instructions.
If the email is not present in the inbox, please check it on the spam and junk folders once.

Hello David,

I am sorry to hear this. To fix this issue, I request you to get our additional support help for which have sent the email instructions.
If the email is not present in the inbox, please check it on the spam and junk folders once.