We started having attachments being stripped with Forefront saying that the reason for the removing of the attachment is an EngineError. Looking at the event viewer I found that VirusBuster had failed installing its latest update. I looked online and found that to sometimes resolve the issue is to remove the offending engine folder and then update again. I try to delete the VirusBuster folder, but it says that I do not have permissions even though I am logged on with the Administrator account. This is on SBS 2008 machine. What am I doing wrong? Thanks for any help.