stopped working

i have xp sp 2.avira personal premium anti virus,and comodo firewallpro been using both about 2months withhout no problem.10 hours ago when i open my pc a pop up window came from comodo firewall saying all its applications are stopped,and reinstalling it may solve the problem.i’ve done that 3-4 times and nothing.i think the last installed applic was ashampoo magical defrag(not sure ) .please provide a solution becouse i’m used to this firewall,and i don’t want to choose another.i’ll post a hijack this log if it helps.