Firstly, try to format the USB flash drive using the FAT 16 file system as most BIOS generally accept this particular format as a bootable medium. Surprisingly, the onboard Windows formatting tool did not work for us. So, we opted to use the "USB Disk Storage Format Tool" from HP instead. After starting up the program, choose the USB flash drive to be formatted and select "FAT" located under "File System".
Enter a name of less than 11 characters for "Volume Label" and click on "Start" to begin formatting.

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After the process is completed, open Windows Explorer and navigate to the root directory on which Windows is located - usually, "C:\". Copy the "boot.ini", "ntdlr" and "NTDETECT.COM" files from the directory to the USB flash drive.
If you can't locate the above mentioned files, try deactivating the "Hide protected operating system files" option found under

"Tooisl Folder Optionsl View" of Windows Explorer. Next, select "Show hidden files and folders" option as well. You should be able to see the files now. Copy them to the formatted USB flash drive.