Have AVG 2015 free and windows 10. Since 8/21 everytime programs trys to update an error message comes up- it has "detected running installation. Complete that installation before running update." As far as I know nothing else is installing and even if something was one time it shouldn't be everytime for two weeks. I ran a complete scan of computer and AVG found nothing.
Chris, Delete AVG using AVG Remover & reinstall. Have a look @ this link (https://support.avg.com/answers?id=906b0000000DLeCAAW).
AVG Guru