11.5/12 = 96% (probably within reason for many p/s companies)
However, an overall system temp. of 65C (you don't specify if 65C is your system temp, your cpu temp, or something else . . .) is smoking hot in my opinion (you really should be posting full system specs; if that's your cpu temperature, no one can really guage if that's too hot without knowing what your cpu is; that said, 65C for a cpu temp seems pretty warmish to me, regardless), and I suggest the heating issue is causing your system to crash. The issue could still be your power supply (Enermax and Antec are respected brands; don't go with generic junk). Or it's also possible your system case doesn't offer proper cooling/ventilation (or your cpu may be overheating). Thick wires or cables, draping all over the place inside your case can block airflow from your fans. Fans are very important (ensure airflow is getting everywhere it should be--and, again, ensure its not being blocked by wires and cables). Could be any combination here. But yes, I suggest heat is an issue here.
Try playing a system hog of a game for awhile while monitoring your temperatures (while playing for about an hour). One suggestion might be F.E.A.R.:
Or better yet, run a Prime95 torture test (Prime is freeware; google it) while monitoring your temps (for about a day, at least, I would say . . . get your system burned in). No system is stable until it's Prime stable.
Okay, friday night I turned my computer on, opened AnyDVD, opened Nero Recode 2, and successfully burned Paparazzi. I don't know what I did differently, but it has worked two times now?
If using Recode is the first thing you did after turning on your system, then chances are your overall system temp. didn't have enough time to heat up so that it could bake bread on top of it, which might be one reason you were able to use Recode without issue (you didn't give your system a chance to reach crazy high temps before burning). Play F.E.A.R. for about an hour (if you can; I bet you reboot before an hour is up), then check your temps; and try burning then.
By the way, I take no responsibility if you follow my suggestions and literally fry your system (what I am suggesting is going to generate heat--and heat can wreck motherboards, cpus, memory, soundcards, and graphic cards . . . ). If you just bought your computer though, nothing I'm suggesting (with the possible exception of opening your computer case--in which case, never buy from that computer store again) is going to void warranties.