As a quick work around copy and paste your attachment into a word document and print it using word.
Sometimes this problem can only be resolved by installation of a bi-directional printing cable. The standard printer cable available in most stores is only a single-direction cable. In order to effectively print from Netscape, you may have to replace your cable with one available from or a compatible IEEE bi-directional cable.
Try turning off the printer and turning back on. Reboot your PCand try printing the attachment. If that fails to work it is probabley a problem with Netscape.
If you have were able to use that function in the past maybe that option has become corrupted. Download an updated driver for your printer.
Try removing and reinstalling Netscape 4.7 or try a newer version.
Keep in mind if you just reinstall without removing the previous version and have corrupted files that they won't be replaced and might continue to cause problems. By removing and then reinstalling the software, you replace all of its files, not just the newest ones.
Since you can print out all of your other documents and If this is just an inconvience I would leave things alone unless you start getting other errors.