First of all download a good antimalware
https://www.malwarebytes.com/mwb-download/
Also download this
https://www.trendmicro.com/en_us/for...kitbuster.html
Reboot your pc in safe mode (google how to, it depends on the operating system you have) and make a full scan with these softwares. If you don't detect anything and you're still paranoid follow this extra step