Acceding to an infopath form by VPN

[co]

I have an infopath form in a SharePoint form library. The form changes the
views with different user's rolles i have created and it works well. But
when i accede by VPN to the sharepoint site and open a new form, infopath
takes the computer's user and no the one i have logged in sharepoint and the
views that i have created don't work well.

Any ideas how can i use in infopath the user of sharepoint and no the one of
the computer?

Thanks in advance and sorry for my english.

Amaia