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In Windows XP SP3 everthing is normal.
This is because the registry hasn't been cleared in setup. The installer clears the registry so should prevent this. Did you copy over r65 or use a portable installation? If so you need to delete the HKEY_CURRENT_USER\Software\Scirra\Construct2 key and it should fix it.
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I just copy all files but the trick with deleting the key solved this problem. <img src="smileys/smiley42.gif" border="0" align="middle" />