I've been having problems with Windows 7 booting very slow, rebooting is quick. Been following the advice in However xperf won't convert my current etl file to xml, saying there is 40982 Events lost. https://skydrive.live.com/embed?cid=54F60AF2014E6B09&resid=54F60AF2014E6B09%21185&authkey=AKU-3eoAz-ajpB8 One I did convert shows PreSMSS taking over 200k ms.