Windows 7: Browsers and .pdf printing

In Windows 7 (build 7000), I am encountering the following problem(s). When the browser is asked to produce a .pdf page, I get a blank screen within the browser window and a dialogue box that says "Adobe Reader" on the top left, has, also on the left side, a large "?" within a blue circle (but clicking on it does nothing), and then an "OK" box in the lower right. After clicking "OK," I can then load the .pdf page by clicking "refresh" on the browser. This behavior is the same for IE8, Firefox 3.0.5 and Chrome 1.0.154.43.
Once the page is loaded, I can only print from the page in Chrome. I get a print dialogue box with both Firefox and IE8 (although the IE8 box is somewhat garbled), but clicking "print" sends nothing to the printer.
If I save the page in IE8 or Firefox as a .pdf file, I can then print the resulting saved file from Adobe Reader 9.0 without a hitch.
Other than .pdf files, I seem to be able to print from each of the browsers without problem.
(I'm also having a problem with my HP scanner software recognizing .pdf files as one of the options--as it does in Vista--so perhaps there is some odd interaction between Adobe's Reader and Windows 7. If so, it shows up most notably with the browsers....)