Kim, Have a look @ this article (https://support.avg.com/SupportArticleView?urlname=Broken-digital-signature-detected-by-AVG).
AVG Guru
Down loaded free trial version and now having major problems opening my quickbooks takes 10 minutes to open or it locks up is there a posibility that this is causing the problem. Did not have this problem until I installed it and tonight it showed broken signature.
Kim, Have a look @ this article (https://support.avg.com/SupportArticleView?urlname=Broken-digital-signature-detected-by-AVG).
AVG Guru