When you copied the Sai file to the USB, did you make sure that it had all the files in the folder included? I once had this problem with Sai where one of the Read Me Text files was accidently sent to the recycling bin on my computer and Sai wouldn't work properly after that, like an electrical device when it is wired differently or missing a single wire it's not going to work properly.
Only other explanation is that the computer's not able to load up Sai.

Thank you ill check that, i downloaded it off off the internet and it decided to work but it seems to be a trial so im not sure ill have to wait and seebut ill check that for sure.

Oh if it's a free trial that you downloaded on the internet then I dunno if you can copy that to even a USB, it might have some kind of protection on it.