at first open "run" and search cmd open with administrator and enter your pc
next diskpat and enter,wait a feow sec automatically open a new windows
type list disk,show your all pc drive
if your pendrive voloum h select drive "H"
type select disk , hit Enter. you show disk 1 is now the select disk.
type clean and enter.you messege diskpart sucessfully clean.
next type create partition primary and enter,You show diskpart succeeded in creating the specified partition.
Type select partition 1 ,enter.
format fs=fat32 and Enter.
type exit and hit Enter.
your bootable pendrive complete sucessfully
you will also bootable pendrive refus software,and easily boot