Google Chrome Virus Removal Help

I’m dealing with incessant pop-up ads in Google Chrome on my Windows PC and I’m convinced a piece of adware or a browser hijacker has slipped in. I haven’t run any antivirus or malware-removal utilities yet, so the system is essentially in its original infected state and ready for a full clean-up... (Budget: ₹600 - ₹1500 INR, Jobs: Chrome OS, Data Backup, Firefox, Google Chrome, Performance Tuning, Technical Support, Troubleshooting)