I have it on both my systems and I only have Acrobat Reader which is free. You may not be able to distribute it but you can include the download link and installation of Reader from the installation of your app.
If you have Reader 5 or 6 then its pdf.ocx. If you have Reader 7 or 8 then its AcroPDF.dll
Add the control to your toolbox....
Project > Components ... > check "Adobe Acrobat 7.0 Control Type Library" > click OK.
(C:\...\Acrobat\ActiveX\AcroPDF.dll)
Then drag the pdf control from the toolbox and drop on your form, resize, and supply a pdf file/path to the src property.
OK, I've put this control on my form and specified the src property but the file won't load. I get the Reader error " File doesn't begin with '%PDF-' ".
Don't tell me - Adobe doesn't like spaces in the path? I'll test this now but if so this is yet another thing to hate about Adobe and pdf files - grr!
Paul Orton
VB6
Visual Web Developer 2008 Express Edition
Microsoft Visual Basic 2012 Express