Hi Evelin,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
If it is a pop-up window comes up when you are open browsers, it would be a scam and it is best to never click on it and never call any phone number that appears on it.
Since you already let them install the software, try the following steps to protect your computer:
1-Check for updates:
Go to Settings > Update > Check for update > Install all the pending updates
2- Scan for viruses & malware with the free Malwarebytes:
https://www.malwarebytes.com/mwb-download
3-Change all of your account passwords and enable 2 2-step verification on your accounts:
https://support.microsoft.com/en-us/windows/cre...
4-Protect yourself from tech support scams:
https://support.microsoft.com/en-us/windows/pro...
5-More steps to keep your computer secure:
https://support.microsoft.com/en-us/windows/kee...
Please let me know if you need further assistance and keep me updated.
Stay safe
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it