Sharepoint Credential Prompt when Opening a form

“We are having a problem/glitch when using forms. When our users open files from our sharepoint site there are no problems but when users try to use forms that were created they receive a prompt for their credentials. The form is still usable because whether the users enter their credentials or click cancel on the prompt the form opens and can be saved. My question is there a way to get rid of the prompt entirely so users do not get prompted anymore. We have tried testing the form by creating a new form list and even publishing the form to a new list. The prompts happen whether the file is a word document (.docx), word template (.dotx), infopath form both in (.xsn) and (.xml). Is there any workaround for this issue. We have Sharepoint 2010 Foundation as the version. The only issues I could possibly think of is since we do not have the Infopath Form Services we may have the prompt because we can not control how forms work in our environment.
Any and all help is much appreciated.”