Just downloaded and installed Free Avast on a win XP machine. Avast appears to be working but when I open the interface page it displays a blank white page.
I did go to the control panel, add and remove programs and did a “Repair” Avast. Still get a white interface page.
Any thought on how to correct this?

If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A