Envelopes do not print properly using an All-in-One Photosmart C410a and C310a

Question

My HP C410a is USB attached. Serial
Using Windows 7, SP2 (Home Premium - desktop); and Windows XP (laptop)
Using Word 2010 (WIN7) and Word 2007 (WIN/XP)
The printer has latest drivers:  PS_AIO_07_C410_FSW_Full_Win_enu_140_222.exe
April 1, 2010
It prints normal pages OK, e.g.: there are no anomalies.
But, when I print an envelope from Word 2010 it does not print on the envelope as expected (a No. 10 envelope), but rather the printer IGNORES the formatting in Word and prints the address as if the envelope in the printer is an 8-1/2”x11” page, in landscape mode (the only correct action).
I have uninstalled and deleted the driver multiple times.
Yes, I last did the uninstall Sunday June 12, 2011; followed by a fresh install.
Yes, I printed an envelope after the fresh install and it printed properly.
Today, the anomaly (the address prints in the wrong location, e.g.: middle of an 8-1/2”x11” page) has recurred.
Between Sunday and today, I did not make any changes in my system, e.g.: no Windows, Office, etc. updates.  And, I did not change any of the envelope formatting or print options in Word 2010.
This is NOT a physical problem, rollers, print head, etc. as the printer is barely one month old --- and do note that the envelope (actually multiple) printed properly the other day - Sunday.
This is not the first time that this has occurred.  Yes, on previous occasions I uninstalled and installed the drivers.
AND, more importantly, I have a laptop that uses the same printer, same driver, and Word 2007.  It too now prints the envelope address incorrectly, e.g.: as if it is an 8-1/2”x11” page.
Hence, there is something inherently bad, wrong, defective, etc. inside the printer itself.
Before sending me on an Easter egg hunt, do notel:
Restarting, e.g.; power off /on /off / on does not work or fix the issue.
Uninstalling drivers and reinstalling drivers does not work, as explained.
Switching PC’s, as explained does not work.
Using different software suites, e.g.: Word 2007 (Windows XP – Professional) and Word 2010 does not work.
There are NO new updates from HP per the HP Solution Center.
What is HP’s solution?

Answer 1

This is not a problem with the printer - Word 2010 has it's own way of printing envelopes and labels that you must follow regardless of the printer. I have included some screenshots below to guide you along - I hope you find this helpful. The 3rd pic has the important areas marked with red rectangles - those are different from the defaults that Word ALWAYS seems to present at least on my system. With the following procedure, load the envelope as instruction in the HP Solution Center How-Do-I... videos (search for envelope - it should be among the first few articles you are presented in the search results).
Regards,
Himanshu