virtualbox.org

I had installed VirtualBox 4.1.6, in Windows 7 machine and Window-8 was the guest OS.
Things were going fine but yesterday after restarting the machine i started getting error "VT-x/AMD-V hardware acceleration is not available on your system. Certain guests (e.g. OS/2 and QNX) require this feature and will fail to boot without it." while trying to start the virtual machine.

Please help me out, I tried reinstalling the virtual box but it did not make any difference.

"VT-x/AMD-V hardware acceleration is not available on your system" means that VirtualBox can not see/use the feature of the host.
Either it needs to be enabled or something else is using it. Post the guests log file (as an attachment)

Please find the log attached.

Confirmed. VirtualBox does not see hardware-v. Make sure that you have it enabled in the bios and that nothing else is using it.
Do you use BitDefender virus protection?

I am getting the similar error while running the virtual machines. I created the virtual machines by installing the images (.vbox).
Any suggestion would be helpful.

What's wrong with the suggestions already given? If your post is relevant to this thread then you already have your answer.

May be this was not the most relevent , although related, post to figure out my issue.
Thankfully , I figured out that the issue is my processor does not support virtualization.
[Intel-Pentium-Processor-B940-(2M-Cache-2_00-GHz)]
Working on upgrading the processor.

Thanks!