Until 3 days ago, I was able to open all attachments to email. Now it won't open a jpg or any other attachments.

Hello

As this is a general question meaning it can relate to many programs which open JPG files, which program are you trying to open the JPG's with.

Furthermore, have you run a Malware and Anti Virus program just to make sure you haven't been infected with Malware and other malicious software.