My MoI 3D close alone when I'm working it

 From:  FCastro (CHICORODAS)
6870.3 In reply to 6870.2 
Only happens with the MoI 3D
The problem only started two days ago, before that worked well.
Already did a virus scan, and has no virus.
My computer is:
Intel Core i3 - 2100 @ 3.10GHz CPU
NVidea GeForce GT 520 - 2Gb
8gb Ram
1TB Hard Disk
Windows 7 Ultimate 64bit SP1