Need some brain power from this wonderful world...

I'm using Vista Home Prem... on an HP Pavilion Entertainment PC ( pretty cool unit )
I'm using a Yahoo address to a Yahoo address ( for that matter to any e-address )

My question is, seems any attachment I create then send is not received clearly to the intended receiver.... WTF. They become scrambled. Any solutions ??

Also, is there a PDF Writer available for Vista (?) or does the MS XPS Document Writer work just as good ( stuff provided by VISTA )???

Somebody please straighten me out...