Unless you get a dialog asking if you want to reset Preferences to Default, you didn’t do it. Did you do it while starting Photoshop?
From the FAQs:
Photoshop Versions 6x and later:
A: Hold down Alt, Ctrl, and Shift keys (Mac: Command, Option, Shift) while starting Photoshop. A dialog box will appear asking if you wish to delete the preferences file.
A2: You can also simply search your hard drive for a *.psp file and delete it. It will be called something along the lines of "Adobe Photoshop X Prefs.psp".
Under Win 2k/XP the preference file will be found at:
%windir%\Documents and Settings\~username\Application Data\Adobe\Photoshop\[version #]\Adobe Photoshop [version #] Settings
[NOTE: You need to set Window’s Explorer Options to "View Hidden Files and Folders" to display the Preference file]
Photoshop Versions 5.5 and earlier:
Search for photos*.ini and delete (the file will be called photos followed by the version number – i.e photos55.ini for Photoshop 5.5, photos40.ini for Photoshop 4.0)
Resetting the preferences will restore Photoshop settings to factory defaults. If removing the preferences files does not resolve the problem you should check the Photoshop Support pages for further guidance.
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http://www.adobe.com/support/products/photoshop.html>
Note that it is possible to keep a ‘healthy’ copy of the Preferences file, so that you simply overwrite the preferences file if needed. That way you won´t have to re-adjust your preferences in Photoshop after a Reset.
More information on Photoshop and Image Ready Preferences can be found at:
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http://www.adobe.com/support/techdocs/312917.html>
Just hit Ctrl-0 to get the "correct" size if it’s too small.