IE | Tools | Internet Options | Security | uncheck/disable Enable Protected
Mode | Close then re-open IE and see if you can print in IE | Now re-enable
Protected Mode (IMPORTANT!).

If you can print with Protected Mode disabled, IE is using folders for
temporary storage that are not set to a Low integrity level.

Vista creates the necessary folders for printing by default in the %TEMP%
folder but many third-party disk cleaning tools (and even some anti-virus
applications; e.g., AVG [1]) mistakenly remove it.

To recreate the required Low Integrity folder:

• Browse to the Temp folder of your user account; e.g,.
C:\Users\Username\AppData\Local\Temp;

• Create a new folder named Low; e.g.,
C:\Users\Username\AppData\Local\Temp\Low

• Start | Run | type or copy/paste the following line (exactly as you see
it) into the Command box:

    ICACLS "%userprofile%\AppData\Local\Temp\Low" /setintegritylevel
(OI)(CI)low

• Use the keyboard combination CTRL+SHIFT+ENTER to run the Command with
Administrator priviliges.

• You should see a message similar to the following:

processed file: C:\Users\Bill Castner\AppData\Local\Temp\Low
Successfully processed 1 files; Failed processing 0 files

• You should now be able to print with IE running in Protected Mode.

Detailed discussion of the above:
http://www.dslreports.com/forum/r20430183-Vista-Printer-that-prints-test-pagebut
-wont-print-in-IE

[The above courtesy of MVP Bill Castner]
===========================================
[1] Some AVG Anti-Virus users have found that uninstalling AVG and replacing
it with another AV app resolves the problem.  YMMV.

(cross-post added to Vista P,F & S)

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