This is  reinstallation USB FLASH DRIVE (2.0, 3.0) Operation System Windows 10 PRO and HOME (32-64 bit) edition created from original and free Microsoft ISO file. Today Microsoft stopped (from 29 of July 2016) offer for free upgrade you old OS Windows 7 and Windows 8 (8.1) for new OS Windows 10. If you accepted  this offer and already made this upgrade, you HDD or SSD has old files and  programs, and old windows folder. For Users with HDD especially Windows 10 working slow (files of OS having a lot of fragmentation). Me recommend to install fresh and clean Window 10. If you do not have  DVD-reader in you computer, YOU can do it from this USB FLASH DRIVE , but before you have to check, that after upgrade Windows 10 is activated, it mean that Microsoft  has made you motherboard digital signed, and now, when you will be install clean version OS Windows 10 from this USB FLASH DRIVE, you do not need Microsoft product key. After reinstallation clean version OS Microsoft automatically made activation you OS Windows 10. You can do it now or you can do it in the future, just keep this USB FLASH DRIVE. Never know when died you HDD or SSD , or after virus attack you will need to reinstall Windows OS. 

Of Couse you can reinstall Windows 10 32-64-bit OS if you already have Windows 10 Pro or home edition installed on you PC (or you have key product to activate you OS), but you want to reinstall fresh and clean Windows 10 OS.  

You need just boot you PC from this USB FLASH DRIVE , follow screen instruction , make choice Windows 10 32-64 bit Pro or HOME,  when program asked key product, make choice "I do not have key product", delete all old partition by one unallocated space, start to install, and continue, follow screen massages. GOOD LUCK. DO NOT FOGER TO KEEP YOU ALL OLD  FILES (if need it for you ) TO ANOTHER PLACE, LIKE USB FLASH DRIVE OR EXTERNALL HDD or SSD DRIVE. OF COUSE YOU CAN INSTALL YOU OS WINDOWS 10 ON NEW HDD OR SSD.