I had created a partition on my HDD and installed Windows 7 in it. It was working fine from long time, so I thought I will remove the original Windows Vista that came with the computer to get some free space, when I tried deleting / formating the C drive where Windows Vista was, it didn't allowed me saying - 'Windows cannot delete system partition', so I was trying various option to change system/primary partition and while doing that I also set the C drive as inactive, however that didn't work either.
I left that as it is and I shutdown my computer, this morning when I am starting it again it is showing me PXE-M0F Exiting Intel PXE ROM. Operating System not found. 
I tired F2 to go in BIOS, but its not doing anything. It doesn't allow me to go in BIOS at all. And I thought I will recover windows but its not identifying the recovery disk as well that I had created when I bought this computer. (Recovery disk does work as I had tried that couple of times in past)
Don't know if this is all happened due to setting partition 0 to inactive yesterday or any other thing that I had tried yesterday.
I am in dilemma... what should I do.. Any suggestion help... plzzz