Please explaing in detail, when you save in PSE 10, which format you use to save it ?
Try changing the location wher you are saving the files.
With which application you are trying to open the files ?
You probably need to save it as JPEG to attach to e-mail.
In those instances where I want to attach to e-mail, I save one version as PSD file. This format will retain the layer structure.
Save another via File>save for web, select JPEG in the dop down (top left), save this (renamed) for transmission. Once mission completed, delete file so as not to clutter up disk.