When I use AGV to scan my computer is also says: The file is signed with a broker digital signiture issued by HP, and listed the below: Is this something I need to worry about??"C:\Windows\Installer\4256e.msi";"The file is signed with a broken digital signature, issued by: Microsoft Corporation.""C:\Windows\Installer\4ef25.msi";"The file is signed with a broken digital signature, issued by: Smith Micro Software.""C:\Windows\Installer\5b13a.msi";"The file is signed with a broken digital signature, issued by: Microsoft Corporation.""C:\Windows\Installer\5d75f.msi";"The file is signed with a broken digital signature, issued by: Microsoft Corporation.""C:\Windows\Installer\5d764.msi";"The file is signed with a broken digital signature, issued by: Microsoft Corporation.""C:\Windows\Installer\8c2e5.msi";"The file is signed with a broken digital signature, issued by: Apple Inc..""C:\Windows\Installer\8cab8.msi";"The file is signed with a broken digital signature, issued by: Apple Inc.."

Hi jambros, ·Do you have multiple security software installed on your computer? A digital signature is an electronic security mark that can be added to files. It allows you to verify the publisher of a file and helps verify that the file has not changed since it was digitally signed.If the file does not have a valid digital signature, there is no way for you to be sure that the file is actually from the source it claims to be from, or that it has not been tampered with (possibly by a virus) since it was published. I see many users who ran scan on their computers using AVG Anti-virus software faced similar error messages.Reverting back to previous versions of AVG has solved there concern. You may refer one example of the same:http://social.answers.microsoft.com/Forums/en-US/xphardware/thread/8445d911-ebb0-4292-96ba-749de4fcb672 If you have more than one security software is installed on the computer, I would suggest you to uninstall security software. Regards:Samhrutha G S - Microsoft Support.Visit our Microsoft Answers Feedback Forum and let us know what you think.