My friend wants to get rid of Cortana from his Laptop , he uses Windows 10

Search on cortana, the circle "Advanced firewall" then open Windows defender firewall, then go to the advanced tab. It's all there.

Hi Sally.
I am assuming you are asking about Cortana.
Cortana is a voice activated personal assistant that you can use to get Weather forecasts, remind you of appointments and/or dates, send email, Etc. A lot of people find this program helpful, and a lot of people find this program annoying, ( BECAUSE IT SLOWS THEIR COMPUTER DOWN). You can disable this program two ways: 1st way, launch Cortana from the search bar on the task bar, click settings from the left pane, and under Cortana the first option I believe, slide the button switch to the off position; 2nd way, type gpedit.msc in the search box to open the editor, go to Local computer policy/ Computer configuration/ Administrative templates/ Search. Then double click the policy named allow Cortana. I believe this is it for the second way. Hope this helps. Let me know.

Cortana, that not-so-popular feature of Win 10, can be disabled by following these steps 1-4

http://www.pcadvisor.co.uk/how-to/windows/how-disable-cortana-in-windows-10-remove-your-personal-data-summary-3633483/
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Disable Cortana in Windows 10 Completely Technical Notes

How to turn Cortana off and on again in Windows 10

Cortana
Visit this site to get more detail.
http://electrohelponline.blogspot.com/

Hiya. Are you actually using a Windows XP PC, or are you the inside of Master Chief's head? :p

- Do you mean Google as in the internet browser?
- Do you mean Cortana as in the digital assistant? Because Cortana doesn't run on Windows XP, in fact it's not out for home computers yet at all, so you may have some sort of virus called Cortana on your computer - if so, do you have a virus/malware scanning program on your computer?