I have a Dell XPS8100 running Windows 7. Whether in Firefox or Chrome, I have intermittent temporary freezes. The cursor will freeze, stay frozen for about a full minute, then suddenly everything is fine again. Can't connect it to a specific action. Also, I am getting intermittent blue screens of death, maybe once a week. Hardware tests all passed OK. Norton and Malware Bytes don't detect anything problematic. Any help to solve this problem would be appreciated.