i used winrar to extract the files contained into the hotfix then figure out what was the file that was updating and then compress using cabarc. also u can use makecab to compress. and to your question about my pack was discussed here....
well i dont know what u find that worring.... your pc scores fine for its configuration. i know u said no buy for new hardware but i strongly recommend u a new grafic card. a nvidia 6600 or an ati 9600 would be nice and also not that expensive.