Help needed! - Incompatible AV Software Running

 I previously installed Kapersky AV and deleted it b4 i use avast Home Edition. However it's (Kapersky) on-access scanner somehow still has effect and is still running although i've uninstalled it. I searched and searched but couldn't find the remnants of this programme. And when every time i start my laptop, avast shows this warning window that it detected Kapersky's still running and avast's main on-access scanner - Standard Shield, P2P Shield, and Instant Messaging Shield were disabled as there can't be 2 on-access scanner active at the same time.
 I really don't know what to do. Can someone help me with this? Thanks in advance! ;)

Follow the instructions on this page: http://support.kaspersky.com/faq/?qid=193239279

You should also deinstall and reinstall Avast

BTW, Welcome to the forums.

See: http://forum.avast.com/index.php?topic=12079.15
KAV removal tool: http://www.ice-kav.com/utilities.php
http://www.ice-kav.com/downloads/util/KAV_Registry_Clean.zip

Please do NOT use Kaspersky anti-hacker together with Avast!
It seems that Kaspersky writes something in the registry that is picked up by Avast! that makes Avast! think there’s another AV program installed.
Although this is not the case (KAH is a firewall, not an anti-virus prog) Avast! will nag you about this.