I think mystartsearch stalked me from PC to Mac, and infested my Google account

[Zahra]

Sorry, long post to explain the root of my problem.
I´m not skilled with malware (or computers..), so all help is highly appreciated, thank you.

The Mystartsearch search engine /home page suddenly popped up everytime I opened up Google Chrome on my last desktop (a PC), and I was never able to remove it, and I never understood how I had made the mistake to let that infect my PC (I never intentionally downloaded it). I stopped using Google Chrome on that PC (with Google account login), and went over to Firefox. It never popped up on Firefox, and I did run malware removal tools to fix the issue, but it never detected anything on my computer system. As well, I rebooted my desktop, deleting all files, pgrograms etc., but mystartsearch was still there when I used Google Chrome.
I also used the same Google account on my laptop with Google Chrome, but mystartsearch never showed up there. Google Chrome worked fine without being interuppted by mystartsearch there, so I always suspected that the problem with mystartsearch had altered itself onto my C drive or something on my desktop(I´m not a computer expert, so I don´t know).

Yesterday I bought a new Macbook Pro, and everything seemed to work perfectly. I installed Google Chrome and logged in with my usual account, and guess what; mystartsearch popped up the next time I opened Google Chrome, which was right after installing! I think mystartsearch somehow attached itself to my Google account, and now I´m scared to login on my usual Google account. I deleted my web browsing history and saved passwords, and made a new gmail account to use for Google Chrome login, and mystartsearch has not showed itself since. I´m afraid that if I try to login on my old Google account, mystartsearch will popup again, and I don´t want to infect my new Mac (I´m convinced it will if I try). I do want my old Google account back though..

So how in the world do I remove mystartsearch from my old Google account? It makes no sense that there is no link between mystartsearch an my old Google account, because how else would mystartsearch show up on my completely new laptop (and after making a new Google account, it´s not there anymore)?
Should I try to fix the problem, or should I just call it a lost case and abandon my old email?

I really hate mystartsearch.

 

[TwinHeadedEagle]

Hello,



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[Zahra]

Thank you very much!
Should I do this on my new Mac, or on my desktop PC? I have had my Mac for less than 24 hours, so I don´t know if staying in Google Chrome with my "malware" account for 30 seconds has done any impact on it, but I´m not the expert here, so I wouldn´t know. What do you think?

 

[TwinHeadedEagle]

I provide help only for Windows machines.