Open up an administrator mode command prompt by right-clicking on the shortcut and choosing Run as Administrator, then type in diskpart to load up the disk partitioning command line tool.
The most important step is to run the following command, which will give you the numbers of the disks, so you can use it in the next command (and not accidentally remove a partition on another drive).
Now that you know the correct number for the disk, you can use the select disk command, substituting the number 1 for whatever number your flash drive is set to:
select disk 1
Now you can run the rest of the commands, which will remove any partitions before creating a new FAT32 partition and setting it to active so it can boot.
create partition primary
select partition 1
assign command will let you access the drive from Explorer, so we can copy the files. You’ll want to copy all of the files from your installation DVD or from the vLite folder over to your flash drive.
At this point you should be able to stick the USB drive in your computer and boot from it. Note that you might have to enable USB flash booting support in the BIOS, and often it helps to use the shortcut key for your BIOS boot menu.