Internet slows down to zero

Dear Avast members,
I use Avast Home (Dutch) already a long time without any problem until the last 2 weeks:
At a moment my internet slows down to zero speed.
When I open windows taskbar, I see CPU use + 60%, non active processes 50%, avast +/- 20-35%, ashampoo firewall +/- 20%
When I stop avast; all seems normal; CPU use 4%, non active: 99%, firewall: 0%
When I start antivirus again: all OK till (?) the problem start again without any clearly reason.
Disable ashampoo firewall 1.2 gives no positive result the same problem occurs when I activate the Windows firewall instead the ashampoo.
I have the latest updates (avast, windows, Ashampoo firewall) working with Xp sp2
I uninstalled avast antivirus en installed the latest download version = no change.
Hopefully you can help me to pinpoint the problem and excuse my English.

Greetings

Unbelievable, I installed the beta version 4.8.1178 and all seem to be back normal, 4 hours internet without problems, hoop fully is this not to soon victory.
All the best
Willyke

Glad that everything is fine with your computer now.
Thanks avast team for correcting the CPU problem with the latest beta :wink: