I don't know what happened. I cannot open any .zip files with Winzip nor Winrar. I get the message that there not valid archive files. It all worked the other day and now it doesn't. The strange things i can unzip file i've downloaded in the last 2 days but non from before that. I've run Noton AV and found nothing. Alos i'm using Winzip 8. Please help. I have a ton of zips on cd and if the've been lost then i'm in deep s***.