Hi Mina,
have run a full thorough System scan with avast ? what did you do before this errors occured ?
what starts with WIN ? (see msconfig)
Info here: http://www.google.de/search?q=EXPLORER+caused+an+exception+c06d007eH+in+module+SENS.DLL&ie=UTF-8&oe=UTF-8&hl=de&btnG=Google+Suche&meta= http://www.google.de/search?hl=de&ie=UTF-8&oe=UTF-8&q=System+Event+Notification+Service+(SENS)+98&btnG=Google+Suche&meta=
Some of this doesn’t look good… :-\