Thanks very much for your feedback!
It just happened again , and looked down in the even log and there were some indicators.
They said :
1) " EVENT ID : 56 "
" Level : Error "
"Driver ACPI returned invalid ID for a child device (3)."
2) "EVENT ID : 100"
"Level : Critical"
"Task Category : Boot Performance Monitoring"
" Windows has started up:
Boot Duration : 114210ms
IsDegradation : true
Incident Time (UTC) : 2010-09-19T12:18:28.656000000Z"
If anybody could help me out at all......i will bow down at your feet and worship you.
Virtually of course