I am typing in MS Word 2007 with MathType 6.0. I

If you have MS Office 2007, there's an option there to print envelopes in MS Word. Just Click on the Mailings tab, click on Envelopes, and type the delivery and return addresses. You can also change layout and other print options there. I'm not sure if this is available for earlier versions of MS Office but most likely it is available on later versions.

do you still have inks left?are you able to make color copies from the printer?
if your answer to both questions is yes then you may have junk files on the pc that's blocking the printer.
try printing in notepad or in wordpad.
if you are able to print from those,then the problem is with ms word's settings.
if not,click on start,in the run or search box,type in disk cleanup and hit enter.a box will come up after disk cleanup is done with calculating how much space you will be able to free on C drive.tick all the boxes and hit ok.

Click on Start button
Click on Run
Type SERVICES.MSC and click ok
look for Print Spooler in the list
highlight Print Spooler,
Click on STOP button then click on START
close the window and check if the print queue is gone.

Alternate method,

Click STart
Click RUN
Type Cmd ( or COMMAND ) and hit enter
In the black window type
NET STOP SPOOLER ( hit enter button )
Type
NET START SPOOLER ( hit enter button )

Repeat the Stop and START Command 4-5 times
End the Command with NET START SPOOLER

Open Printers and faxes folder - Refresh the Window - the printer will show Status ready with 0 document

1. Office Button --> Print --> Page Setup --> Memo Type
2. Print layout shows wrapped text, that's disabled in MS Outlook 2007, you can customize quick accrss bat fot it:-
Office button --> Customize --> Enable all tools --> Select Print Layout View

maybe the ms office 2007 that you have i just a trial version and your trial version has expired or you have a microsoft office viewer only which means that you can just open and view a certain file but you can't edit them or type anything at the file.

try using a different font style.

yes.search on google....the program is named MathType 6

the printer appears to be working since you can print outside of Office 2007. Verify that the default printer on the print settings ( File>> Print Setup) on your Office application is set correctly. If no go, you may consider reinstalling Office.

The problem may be the printer driver. When the printer was installed, it most likely defaulted to the HP PCL driver and your program may be wanting to use Postscript.

If your operating system is XP or Vista, both PCL and Postscript drivers are included. Simply go into the "Add Printer" wizard and install the printer again using the Postscript driver. Then try your MATHTYPE program and see if the equations print correctly. If not, you probably need to talk to whoever wrote the program to see if there are program specific drivers for their software, or if only certain printers are supported.