Exactly the same result. No text.
Systemwide, then. That rules out a lot of possibilities. The fact that you're 64-bit suggests another possibility.
I'd like to try another complete uninstall/reinstall, with modified instructions. The modifications are because the instructions in the standard Apple document:
[Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7|http://support.apple.com/kb/HT1923]
... are still inaccurate for 64-bit systems (at the time I write this post). Mistakes in the "Verify iTunes and related components are completely uninstalled" section allow for the possibility that damaged Apple Application Support program files may stay on your PC after the uninstall procedure, allowing problems caused by them to persist through after the reinstall of the newer version.
So, try running through that document again with the following amendment. When you get to the "Verify iTunes and related components are completely uninstalled" section, at *step 9* stop using the instructions in the document, and start instead using the following instructions:
(9) Right-click the Apple folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
Note: If you have a 64-bit version of the Windows OS, continue with step #10. Otherwise, skip to step #17.
(10) Open the Program Files (x86) folder.
(11) Right-click the iTunes folder (if it still exists), choose Delete, and choose Yes when asked to confirm the deletion.
(12) Right-click the iPod folder, choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
(13) Right-click the QuickTime folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
(14) Right-click the Bonjour folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
(15) Open the Common Files folder.
(16) Right-click the Apple folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
(17) Open Local Disk (C:) located in Computer or whichever hard disk your operating system is installed on.
(18) Open the Windows folder.
(19) For 32-bit versions of Windows: Open the System32 folder.
For 64-bit versions of Windows: Open the Syswow64 folder.
(20) Right-click the QuickTime file (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
(21) Right-click the QuickTimeVR file (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
(22) Right-click the Recycle Bin and choose Empty Recycle Bin.
After that, restart the PC and try another iTunes reinstall. Does it go through okay? If so, do the text problems clear up for you in iTunes?