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"write-protected USB flash drive..."
What make and model is it ?
"... format software download plzz give me this software?"
Some flash drive models have a tiny switch on them you must move to certain position if you want to write data to them.
If it has no such switch, then it's write protected by software on the flash drive.
If you don't know the password for that software, you probably cannot format it.
If your problem is Windows "thinks" the drive is not formatted and you know it was, or if you don't get that but you cannot access files on your own flash drive that you know you could access before, if you are not being prompted for a password, that's a completely different matter.
You have probably damaged data on the flash drive by you unplugging the flash drive while Windows was running without clicking on the Safely Remove Hardware icon in your taskbar and choosing to STOP accessing the drive. That's VERY COMMON.
If you use certain programs to fix the data damage, you will probably be able to access most of or all of the files on the flash drive again.
OR - flash drives DO NOT work properly in all possible USB ports you plug them into.
Troubleshooting USB device problems including for flash drives, external drives, external memory card readers.
See Response 1:
NOTE that if you have damaged data on the flash drive, often it's the partition table data you've damaged - if that's been damaged you cannot format the flash drive unless you delete the partition (the FAT32 or FAT software partitioning) on the flash drive.
You cannot delete the partition on the flash drive in Windows itself.
If the flash drive is NOT write protected, and if there's nothing wrong with it's partition (software partitioning data) then you can easily format it in Windows itself. E.g. RIGHT click on it's drive letter and choose Format.