Hello Guys,thank's for looking,
windows explorer started crashing after i used Bit defender tune up option to optimize registries ,later i restored this,still problem continued,though system restore will help,but starting system restore in safe mode also doesn't solve the issue.
Says some problem not able to fix,so i have attached the cbs.log file (the size is bigger the limited size to upload here so i converted it in to pdf,pls forgive me
its having lots of pages)
Your advise is much appreciated.