Illustrator CS3 cannot save file

If Illustrator freeze on save and cannot save any document.
you should go to edit some part of "Settings.xml" that locate as follow

Documents and Settings>Username>Application Data>Adobe>Workflow>Settings.xml

Use notepad to edit file Setting.xml
just delete everything in between " " in the section name dialog-save, and dialog-open

<****q:section position="xxxxxxxxxxxxxxxxxxxxxxxxxxxx" name="dialog-save"***>

<****q:section position="xxxxxxxxxxxxxxxxxxxxxxxxxxxx" name="dialog-open"***>

<****/q:section><***/q:section>

From example delete all xxxxxxxxxxxxxxxxxxxxxxxxxx only "" left there.

Then try re-Open Illustrator and test. Good Luck!