L&S freezes system

Hello,
My problem is (sometimes): When a new application tries to get access to the internet, the whole system freezes. Sometimes I can bring my system back by pressing ctrl+alt+del - it's like it has been blocked by LnS and the "released" by the taskmanager. Otherwise I only see the LnS application-authorization window without any chance to do something. I already tried uninstalling and LnS Sp3 but without any success. My sys is XP sp2 (+kaspersky anti-virus)
Thanks

 

If using KAV 5, have you disabled the IDS networking module?

 

I even disabled KAV completely but no change there Sad thing is, LnS and KAV worked for long time perfectly together since last week. And I didnt change anything at my security settings.