I can't tell what could be the cause of the issue without knowing more. Please provide us with details what "stuff comes up every time". You could create a screenshot and upload it to some online storage service to show us the exact problem.
Without knowing more, these FAQ's may provide more details:
Infected system file is repeatedly detected by AVG and not removed
Warning in a test result
Information in a test result
What are tracking cookie files?
I ran AVE everyday, but the same stuff comes up
every time, so I don't believe the AVG really removes