Hi everyone !
Please check these different posts :
http://moodle.org/mod/forum/discuss.php?d=52216
http://moodle.org/mod/forum/discuss.php?d=49680
http://moodle.org/mod/forum/discuss.php?d=48298
All of these are different people facing similar problem, that the cron.php or sometimes some other php file wants to download instead of executing in explorer. I've faced this problem with both php version 4 & 5 and it majorly occurs when a verion of moodle is upgraded from 1.5 to 1.6. Setting the permissions to execute makes no difference. Also, with all settings same, a fresh 1.6 install doesnt have this problrm, while an upgraded one does.
In my case, the cron.php file isn't running at all, it just wants to download. Do any of you gurus have any ideas ?