I'd rather help you upgrade your database and installation than wasting time on an outdated and unsecure Moodle installation.
I would recommend to make a local copy of you Moodle installation for developing and testing purposes and try upgrading from 1.5 to 1.9. See Installing AMP for details.
Security and privacy
Anyway to keep on using moodle-1.5.3 just for forum viewing purpose only
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