perpetuations

Ultra ISO can write the ISO file in the flash drive.If the iso files is bootable you can use the SD flash drive to boot.Some PE has the programe to install in the flash drive to boot.

the old files can be delete directly

U can get into the safe mode means that is not a hardware issue.use the hp recovery program to recovery the os

Use nlite to make a dvd that include the drivers.

You can also use the command like:rename DSC-???? or rename DSC-*

http://www.zipghost.com/ maybe this software can solve your problem. I learnt of that ACDsee can mass rename a buntch of files.