you aren't telling us what the attachments are (the file format) nor the application you are using that has attachments. We will GUESS that you are meaning email attachments (but won't guess the types) and there may be various causes.
Since you mention TWO Operating Systems should we automatically assume you experiense the problem in BOTH or only in one and if so which one. Could you take a moment or two and tell us the application (or email client(s)) you are using as it is most likely simply how you have things configured.
You really have to help us help you.
Suddenly I'm having a problem opening attachments. When it tells me there's an Attachment, I can open it but when the picture or whatever is in the body of the message, it has clear boxes and I can't do anything with it.