Hello Van,
I am sorry to hear this.
For this error, run AVG remover followed by Clear tool as mentioned (here).
NOTE: If there are no AVG program found, click on "Run Anyway" to proceed with the removal.
To install AVG Ultimate, follow the steps as mentioned (here).
Keep us informed about the status.
I have downloaded my AVG Ultimate after renewing, and I get an error message while trying to install. Error code # 0xe001f94e. This error code is not listed in the help section.