Critical Error while running a virtual MAchine

[ArunT]

Critical Error while running a virtual MAchine

[Socratis]

That's the error you're getting:

00:01:12.296746 !! VCPU0: Guru Meditation -2403 (VERR_TRPM_DONT_PANIC)

And this is "why" you're getting it:

00:00:03.984263 HM: HMR3Init: Falling back to raw-mode: VT-x is not available 
00:00:05.906916 Full Name: "Intel(R) Core(TM)2 Duo CPU T5870 @ 2.00GHz"

Unfortunately, your ​Intel Core2 Duo T5870 does not support VT-x. So, you can't run this VM. Your best bet would be to try something from the 4.3.x series, or the 5.0.x series, or the 5.1.x series (all of them unsupported). The higher the VirtualBox version, the more dependent it is on the existence of VT-x, as the "raw mode" (mentioned above) tends to get phased out.

[Socratis]

I forgot to mention that it's usually better and faster, if issues get first addressed in the ​VirtualBox forums, a lot more eyes. More than 95% of the issues are resolved over there, which keeps the developers focusing on the bug fixes and enhancements, and there is no need for another ticket to keep track of.

For example, yours is not a bug and someone from the developers has to deal with it and close it as "Invalid".