Well there are a couple of choices to do what you want. You could install grub, but you may find you have missed some files or unless you intend to use it on one PC all the time it will not be configured for any other machine.
Choice 1.
Clone the One CD onto the memory stick. Then it will depend if the PC will boot from a memory stick/flash drive.
Choice 2.
Copy the PCLinuxOS ISO as is and use it in the same way a you would the CD.
Both choices are very similar and all the necessary files are already compressed/archived as we call it. Of course the pc will need to be able to boot from a flash drive, although there is a way round that if required.
I could not get my first method to boot
with grub installed.
Second try , I used 'PartedMagic' (See my other Post about that free software) to re-format the memory tick, again with RFS and bootable, then with the tools on the above disk copied the Live CD files to the stick.
Set the bios of a test machine and tried to boot from the stick, it gave error 'Cannot find boot record etc.'
How do I find out what boot record is on the live CD so I can copy it to the memory stick ?.