Now it will install but it's been a disaster. In fact I'm just recovering from the third clean install of Windows XP Home this week!!
GreyKate, it's really a pity but what's going on...
The new version works smothly for all of us.
Did you install any other antivirus in your system?
Are you using a firewall?
The Registration code cannot 'freeze' avast or make the system slow...