Just a little FYI on this issue..
I have klif.sys showing up on my clean install of windows.. after deleting a dirty install of windows that got a trojan within 20 minutes.. (stupid ie6)..
Anyways, Neither install ever had kapersky, I use avira, and I am having irql_less_or_not_equal bsod's because of this klif.sys file
so there may be some merit to this guys problem..