Windows 10: Microsoft account security breach and home PC

Hi.

Recently my gmail account was hacked (no 2FA enabled, big mistake). This gmail account was also used to create my Microsoft Account. I still have access to my Microsoft account,but I cannot change the password or completely delete it because it sends a confirmation e-mail to my lost gmail, and I got a one month lockdown (of accessing critical stuff) on my Microsoft account trying to change password withan alternative e-mail. Now at this point I have pretty much accepted the gmail being gone, and the Microsoft account as well.

My concern is what to do from this point on to cut the ties between my computer and the said Microsoft account. I'm worried that since I've been using my computer with this Microsoft account, could the hacker access anything important, such as stored passwords (for various websites and applications like Steam etc.) or saved files (things on desktop or other drives) if they manage to login to my Microsoft account from another machine. I have of course enabled 2FA on anything important after the incident, but I'm worried that continuing to use the same install of Windows might somehow keep updating the initial Microsoft account about what I'm doing on the computer, such as updating my passwords and saving them. I know I rather sound paranoid but that's exactly how I am right now.

What should I do? Do I need to format the PC and make a clean install with a completely different account? Or is there a reliable way of completely severing the connection between the Microsoft account and the current install of Windows?

Thanks.

:)

 

security or privacy breach at Microsoft


"years old original Skype account user name is "first.last". The new unauthorized Skype account user name is "coincidentally" my Microsoft Account user name which is just a unique string and when I created the Microsoft Account I used my gmail address as the string so it is "first.last@gmail.com"

If both account sign-ins are the same gmail.com address, there's no issue. By 'User name', are you referring to the name next to your avatar or the sign-in name? The other issue is which version of Skype you are using, the new Store app or the 'classic' Desktop. Here's a screenshot of what my upper L corner looks like in both versions. The L grab is from Desktop, the R from modern Skype app (no name next to avatar but click avatar, you see User name and email). They have the same sign-in email and the same User name next to my avatar if I Skype somebody. Post yours to clarify further.

 

security or privacy breach at Microsoft


The following is me having a conversation with myself using my LiveID that MS assigns to the Skype Store App automatically and the Desktop Skype with my Skype ID from years ago...

 

Bogus Security Breach Calls/Notices

You can be sure because Microsoft never ever makes such calls. There is no security breach but someone's trying to scare you into giving them access to your PC.