Bios Update

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nothing hapening when type autoexec.bat,the cursor moves to the next line and just blinking,in the next line nothing is writen,there is just a blinking cursor.When i pres almost any key the bios sound is apear.I put out usb and restarted the pc,everything is normal again.any sugestions on that?
 
nothing happens,i got a message something like-file not recognisible as batch executable file-i cant remember.I forgot to mention that autoexec.bat is not visible on usb but it is there,becouse when i copy again downloaded bios on the bootable usb drive ask me to replace that file,I had to download also dos files for usb which give me a lot of trouble to find matchable dos becouse when i tried to format with hp tool i was getting error message something like-cannot format becouse dos files are not compatible with fat32-then i found win98boot files on internet and used them during formating usb.Then i placed bios files on usb.2 of them are invisible.I set boot priority to usb and then i restarted and the dos comes up