Windows 7 - Windows 7 x64 BSOD - No dump

I Bought a HP DV7-2185 notebook with win vista and formated the disk to install the win 7 ultimate 64.

It always got me the bsod... WITH NO DUMP FILES creating! I even tried the utility "Bluescreen View", to see if the dump files was hidden somewhere, but it does not find it... or in the root, "windows/minidump" folder.. anywhere.. it simply does not exist.... I updated every driver from HP website, even the bios one.. no luck....
It crashes when I leave the notebook downloading something with IDM (Internet Download Manager) or when I'm navigating.. the system get slow and then..... crash!....
After that, my laptop freezes many times when I get to restart it... Its very random, some days it doesn't happens, but it's driving me crazy man... Since it does not create the dump files, I took a picture of it:

http://img695.imageshack.us/img695/4396/bsod.jpg

It also seems it is degenerating my system... Sometimes it block my system Start, and also, in repair setup, my disc is not recognized... After a few restarts the system works... And back to work ok... Like nothing happened, as I'm typing right now....

There is a fix for big HD, but mine is 500gb, so I think thats not the problem...

If someone could help, I would really appreciate.
thx all.