the simplest way to a possible change would be to COMPLETELY uninstall AVG inclusive of regedit and search with the words Grisoft and AVG to clear all traces of AVG and then a brand new install.
please ensure your sister notes the Serial number as this will negate the neccessity of going to OE to obtain a new serial number.
once the install is done and definitions updated run a full scan.
in the alternative she can go to
click on the free on line scan on the left side of the page and run it to ensure she is clean before the AVG install.
I updated AVG (free version) on my sister's pc on April 21, as she had not done so since April 15. When I ran a virus scan, after the virus updates were installed, the scan stopped before completion and a blue screen popped up showing a fatal error on O/E, which was not even open. I wrote down the error, but my sister threw my note away. Her pc also started having problems restarting---it won't boot into Windows. The screen stays frozen at the Compaq logo.
O/S is WinSE98 running on a Compaq PC X20. 750 MHz.