Avg updating every day
And perhaps uninstall AVG and install something else.
If you're running Vista or Windows 7, I've found Microsoft Security Essentials to be perfectly adequate.
This company have been offering products that do not work.
We find AVG doesn't use as much as other anti-virus programs and the settings are adjustable.
If you installed AVG today, then what you are experiencing is not an update, but rather the Cache Server.
The first day you install AVG there will be a lot of activity on your hard drive as the software builds a cache of what it considers safe files.
We use AVG ourselves at Computer Plus for office and home computers.
Once installed on your machine AVG will protect it for you, only popping up if it needs your attention.