Good. Well I see that retook Bug. yet I tell them to install the version for windows 7 professional 64 bit SP1. Reinstall Blender 2.71 for Windows 64-bit and it worked. It was a matter of updating the windows. Thank you.

Good, I have a question. which is the difference of using Blender version 2.71 for Windows 64-bit and 32-bit same. Bug posing for my computer AMD A10 5800K 3.8 GHz, 8GB Ram, Graphic Card Radeon HD 6670 and Windows 7 Professional 64-bit. As work 32 bit version?

Sorry I have not written before, some obligations prevented me from doing so ... however, I have looked in most blogs registered in blender help this problem does not arise. Still ... I return to describe the software and hardware equipment.