Open the command prompt ("dos" window):
==> Go to "Start" ==> "Run as ..." ==> type 'cmd', press <Enter>
==> Got to "Start" ==> "All Programs" ==> "Accesorries" ==> "Command Prompt"
I don't use windows anymore so I am not completely sure that the names are correct.
Once you are at the command prompt, You have to change the directory to the folder where ubcd2usb is located. I suppose that you have extracted the iso to c:\ubcd.
To see which files are in the folder, use 'dir' (you don't have to use this command but it can be useful to know) (If you type help, you can get an explanation about every command available).
dir should display 6 file. One of them is ubcd2usb (ubcd2usb.cmd or ubcd2usb.bat (I don't remember it very well).
It will display the following:
UBCD2USB: Create a bootable UBCD memory stick
Usage: UBCD2USB (UBCD-path) (USB-drive) [-Y]
Params: -Y : No format-warning, no pause (for batch-mode)
Examples: UBCD2USB e: f: -y
(UBCD-CDROM in 'E:', USB-key in 'F:', no warning)
UBCD2USB d:\ubcd f:
(UBCD extracted in dir 'D:\ubcd', USB-key in 'F:')
Required: W2K/XP/W2K3/Vista and an (optionally extracted) UBCD
If you have extracted the ubcd iso to c:\ubcd, and your usb thumb drive letter is x: (see in explorer which drive letter your usb thumb drive has and change the x: in the following command with that letter).
ubcd2usb c:\ubcd x: