Recently I've been having problems with the boot of Windows 8.1. Here's some information of the boot trace: As you can see the PreSMSS phase takes way too long - over 96 seconds - and the ExplorerInit phase 17 seconds which I think isn't normal since my system used to take 30 seconds or less to completely boot. Also the duration of the PostExplorerPeriod and TraceTail phases are set to -1. Is this some kind of bug? Can somebody please help me? PS: I attached the .xml file with all the information of the boot trace. summary_boot.xml