sed "s/\(\w\)\('\w\)/\1\\\\\2/g" file
INSERT INTO Employee(RealName,DisplayName,ChineseName,CSLogin,BusinessTitle,Department,Company,Location,Country,City,Email,Mobile,UPI,NokiaID,NID,NokiaAccount,BossNID) VALUES('BILBEE Sashi ','Bilbee, Sashi (Nokia - US/Naperville)','','palanisw','Head of Americas Repair Stgy & ION Eng\'g','MN Services','Nokia of America Corp.','US/Naperville','US','Naperville','sashi.bilbee@nokia.com','+16303999260','PA0001546','69045105','120632','nsn-intra\palanisw','125333');