Oscommerce sets it's own tmp directory.
The easiest fix is to run the install again and set sessions to use the database.
otherwise you will have to look in the database configuration table,
find the entry 'Session Directory' or similar and set it to "C:\WINDOWS\Temp" (or whatever your temp directory is.)
Changing it in php.ini will have no effect. (but you still should change it to '
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