I searched the forum but couldn't find this. I apologize if duplicating a question. I have an HP DV6 laptop Windows 7 64 bit. I am running nod32 5 antivirus. The laptop has started randomly locking up. I've run malwarebytes scan and the nod32 with no virus/trojans showing. I would like to run a scan in safe mode. I see it opens a dos window. I've looked at various posts. Some seem to say that something must be downloaded to run in safe mode. Is this true or do I simply reboot into safe mode then open the nod32.Will the scan run and have information in that window? Also approximately how long will it take the scan to run in safe mode? Thank you for helping. I am a novice and trying to learn as I go.