how can i fix virus

Do you have some antivirous software installed on your computer?

If you do, scan your computer using it.

If you are concern about malware, try:
Exploit Scanner plugin or
online scanner to check for exploits and malware: https://sitecheck.sucuri.net/scanner/

Your theme or website doesn’t have any virus after checking your source.

If you are using chrome then try it with mozilla or another browser.

yes i think it is my computer. what must i do? i have mc affeee

Install Malwarebytes Anti-Malware, it is free. Update it and scan your computer.