@cwsink: first of all, thank you very much for your time and willingness to help. And for the welcome too. :)
You said it was caused by Chrome. Do you think it's a Chrome fault or it could happen with any app/browser? (I'm almost sure the last minidump happened when I was using Firefox but can't remember exactly) BTW, I'm using only Firefox for 2 days and didn't have any BSOD episode...
Also, do you think that, for testing purposes, I should uninstall the Intel video driver and use the default one? Is it possible that, even with all signed drivers, the BSOD still occur? I've researched and found that this kind error is generally attached to a faulty video driver. Of course it's not the correct fix because I'll lost the Intel display config apps and so, but since the driver is not signed and I must disable the driver verifier at every boot in order to use it, maybe it has something to do with the problem.
About the Windows updates, I tried to edit this part of the initial post, but didn't find an editing button. I don't have the Windows 7 disk, as the OS came pre-installed in my setup. I've done some checking and it is a fresh install, without any aditional software, patches or updates.
I don't like the idea of installing tons of updates without having the W7 installation disk, but if it's my only choice, I'll do it. In this case, what would be the best way to update this system? Is there a package I could download with everything I need to install? Should I create a restoration point?
Totally out of curiosity, could you please post a snippet of the dump files and explain a little about your investigation method?
Sorry for the lenghty post and for these many questions.