Operation systems (Win7) constantly shut down in Ubuntu

[BLOGG]

Please, tell me how to solve the problem. When I use any system (I use Win7 usually) in VirtualBox, after about an hour or two hours it shuts down independently. What should I do to use systems without autoshutdowning? What is the reason of such a behavior?

[mpack]

Please provide a VM log file, and other information as described in Minimum information needed for assistance.

[mpack]

I have deleted the truncated log file you pasted in. Please read the link and provide a zipped log file as instructed, i.e. as an attachment, not pasted.

Something you might try first is to disable any screensaver or power saving features inside the guest.