Re: Update: I have the OSX 10.5.5. I tried both, the 10.5.6 & 10.5.7 update but in vain. So may be i'll try the 10.5.8 this time, I hope that works.

Re: Startup Disk: The only thing is that one extra disk which I wish to delete. The extra disk shows up only on start up (on pressing alt/option). But it won't be seen under Disk Utility neither Startup Disk. And yes, there are two Mac OSX (the first two) the second one will not start, only the first one will and the third one is Windows Vista.

P.S: I was provided with Parallels too but after installing Vista it refused to open it. So i removed it. My Vista has booting problems giving messages such as "Rebooting:Failure" before every startup, but it will always startup after those messages. So along as it starts up, its just fine.