An infection (virus, malware, spyware, ransomware) is what it is. Computer make, model, OS, are not a factor.
Do you have an Anti-virus APP installed ? If not, you better get one.
Run your Anti-virus Scan. If it does not run in normal mode, down load RKILL and run it 1st before the scan. If no joy, try running scan in safe mode. Also, There are some very good malware scanners (malwarebytes) is recommended.
Then of course, if you cannot accomplish any of the above to remove the infection, Kapersky Labs has a rescue CD or USB (your choice, or both) to download and burn to boot from to scan & remove infections.