Windows7 doesn't start since AVG Ultimate Installation

Hello Rita,
We sincerely apologize for the inconvenience caused.
This AVG watchdog is a known issue and our developers are almost in final stage to find the fix.
By following basic troubleshooting method we can fix the issue.
We request you to unplug all the external devices that are connected to your CPU via USB ports.
Please restart your PC and press Esc or F8 keys repeatedly and check whether you get the "BOOT" screen.
Thank you.

Hello,

Since I installed AVG Ultimate and after doing the "first scan", my PC does not start anymore. It only shows the Windows screen "Initializing Windows" and afterwards it keeps rebooting itself.
Alreasy tried the Steps with AVG Rescue CD but without success.
Now I need help, and I hope AVG didn't break my PC.

Thanks for your help in advance.

Hello Rita,
We sincerely apologize for the inconvenience caused.
This AVG watchdog is a known issue and our developers are almost in final stage to find the fix.
By following basic troubleshooting method we can fix the issue.
We request you to unplug all the external devices that are connected to your CPU via USB ports.
Please restart your PC and press Esc or F8 keys repeatedly and check whether you get the "BOOT" screen.
Thank you.