Has your problem been solved? Daugava is an ad-supported application that often enters the PC stealthily by being bundled with other freeware. You can perform a scan of your system with the free version of Malwarebytes and then delete all the threats detected. Or follow the instructions in the posts below to manually get rid of the adware.
Remove "Ads by Daugava" virus (Easy Removal Guide)
How to Remove Daugava Ads? – Adware Removal Guide | Uufix Security How-to Guides

Good luck.