Hi! Your site has been reported as malicious, because it allegedly "Installs unwanted or malicious software on visitors’ computers". It might be that the site was compromised at some point, or it could be just wrong information.
I don't have more details to share, but https://transparencyreport.google.com/safe-browsing/search?url=https:%2F%2Fgmfp.wapda.gov.pk%2F contains more information, and the follow-up links on that page also explain what you as a website owner can do to resolve this issue and get the warning removed.
