Internet Explorer 7 and Acrobat

Internet Explorer is supported for use with Acrobat and Adobe Reader version 7.0.8 and 8. For versions of Acrobat earlier than 7.08, most functionality will work, but there may be issues with forms workflows. If you run into any sort of issue, then you should upgrade to at least Acrobat or Adobe Reader 7.0.8.

Or:

Configuring the browser to open PDF files in an Acrobat window:

If you want the browser to open PDF files in a separate Acrobat window, then configure the browser to use Acrobat or Adobe Reader as a helper application. Then, when you select a PDF file in Internet Explorer or AOL, the browser opens the PDF file in an Acrobat window instead of the browser window.

To configure the browser to use Acrobat or Adobe Reader to open PDF files:

1. Close your web browser.
2. Start Acrobat or Adobe Reader.
3. Choose Edit > Preferences.
4. Select Internet in the list on the left.
5. Deselect Display PDF in Browser, and click OK.
6. Restart Internet Explorer or AOL.

Note: The next time you select a link to a PDF file, the browser may prompt you to open or save the file. If you choose to open the file, then the browser opens the file in the helper application that you specified. If you choose to save the file, then the browser downloads the file to the hard disk.

For more details, visit the Adobe website here.