Saving a .pdf file to folder

Hello,

I have Vista Ultimate installed on a PC on which I am the only user. I
paid a bill online and when I tried to save the receipt document as an Adobe
PDF file to another drive, I got the message that I could not save to the
folder on thast drive and that I had to contact the system administrator.
The folder I had tried to save to was in my old 'My Documents' folder on a
seperate internal drive (non system drive). BTW Adobe Professional is
installed and has a printer driver installed so that I can savwe documents
as PDF files. Is there a simple switch to turn off so that I can navigate
freely around my own computer?

Thanks,

Shane