Windows, Bootup Problems, what else is new?... :/

so my brother tells me his pc is acting up, so I check it out, (after removing a trojan days earlier)

so I run AVG, I get a boot disk read error, so I think, oh great, a root killer, yet I'm still able to run windows... well I did a few diagnostics, like chkdsk,
well at one point, I had to reboot, just to get stuff done, a rather invasise test, a memory test actually, just to check on that...

well windows wont load, no loga anything, you see the basic boot instructions but when it tries to boot windows, blank dark blue screen, almost black, not a BSOD,

so I'm a little confused, because the only thing that came up was the boot sector problem, no viruses or anything, but heres the kicker...

not only does safemode work, but more perplexing is the fact that sometimes it does boot in normal mode, sometimes it doesn't,
behaviour like this isn't consistent with a MBR corruption/error, where it wont boot at all...

here what I got from CHKDSK, it ran with admin privledges but, it still gives me a "cannot continue in read only mode" :/



my ntbtlog file provided the following:

ehhh the ntbtlog info is freezing Firefox, to much text I guess.... any ideas?

oh I'll post Spybot info when I run it