PDFControls.NET 2.0

What is the difference between the Standard and the Professional edition?

In addition the Standard edition, the Professional edition allows you to fill in fields, interact with annotations, add new content, delete, add and move pages and save changes.

I open the type reference (.chm) but each page seems to be missing?

By default XP SP2 does not trust a .chm that originates from the internet. Right-click the help file, select 'Properties' and click the 'Unblock' button on the 'General' tab.

Is PDFReaderControls.NET Vista, Windows 7 and Windows Server 2008 compliant?

Yes, fully.