Will not print priority mail labels from USPS using Adobe Acrobat 10.0.1.434 and Windows XP

Question

I click on pay and print and PDF does not load or bring up print function box for my printer. Screen says it's done but no label is there. I have successfully used Mozilla until most recent update [3.6]. Now I have to use IE or Chrome on the USPS site to print out the labels. I contacted USPS and they suggested deleting McAfee which downloads with Adobe Acrobat Reader 10.0.1.34. I tried to remove the McAfee program (even by downloading the uninstaller and XP add/remove programs cannot delete it. HELP! Thanks.

Answer 1

I have found another possible bug affecting network printing with 10.1.2 in Protected Mode on XP SP3 machines that has not been previously documented:
A number of users in one office were not able to print with 10.1.2 in Protected Mode (even with the printing hotfix/patch previously released) to their default printer; however they were able to print fine with 10.0.1 in Protected Mode OR by disabling Protected Mode in 10.1.2.  They could print to Microsoft XPS Document Writer, however.
The cause was determined to be an issue with capitilization of the printer name in the registry!  10.1.2 in Protected Mode seems to be sensitive to this for some strange reason, though other apps don't care.
Check the following keys and ensure the capitalization of any references to name of your printer (or UNC path of the printer share) is consistent:
HKCU\Printers\Connections
HKCU\Printers\Settings
HKCU\software\microsoft\windows nt\currentversion\windows\Device
In our case, the reference to the name of the default printer was in lowercase, while the printer path recorded under settings was in UPPERCASE.   Changing this to match immediately fixed the problem.