com initialization error messege

hie guys.

i have zone alarm internet security suite 6 installed on my windows xp home machine. for the last couple of days i have been recieving a com initialization failed error messege and it appears that the antivirus/antispyware dissappeared from the suite. i have tried uninstalling it removing all files and registry entries, restarting and reinstalling but i still get the same messege. i thought it was a conflict with spysweeper but i proved myself wrong when i disabled it during reinstallation. is there something i'm missing. is this a common error, is there a fix? please help.