yesterday I’ve downloaded the latest Avast! And he wanted to do a system check on my windows XP system. When he found a Trojan he prompted what to do and i had to type a number to select my chose. but he doesn’t respond to what a type… so he wont go any further.
Is there a scan when windows is running or is this a known issue and you can help me further?
Bram
Hello and Welcome 
What kind of keyboard do you use? Is your keyboard an USB one?
yes, wire-less But other prompts at start up do respond well.
OK, then can you try to enable USB/Wireless keyboards/mice in your BIOS settings so they can be detected and used in a non windows environment ?
BTW, here are some related topics 
http://forum.avast.com/index.php?topic=17254.0
http://forum.avast.com/index.php?topic=19263.0