All of a sudden, there is no text in my emails - I click them open and there is nothing there. Can someone help me? Thanks.

It this on ALL mails or just certain ones ?
Are there any attachments ?
Is the web mail (hotmail, Yahoo, etc) or ISP mail ?
What mail client, if any, are you using (outlook express, etc) ?

The more information you give the better we can help.

I'm using my Yahoo email that I have used forever - there aren't attachments - just regular email that I have always gotten - We have another email address that does use Outlook - that is working fine - just my Yahoo email is messed up.

So this is a webmail account then.
Have you tried completely clearing you internet cache and trying again ?
Tools > Internet OPtions > General Tab > 2 Delete buttons and 1 Clear button.

Are you talking about the "delete cookies" and "delete files"

Yep and history too.