what is a good free flash program that wont crash my computer and slow it down
This is, in my opinion, a very nice (and free) animation program.
I'm fairly sure it exports to SWF, so you will be able to submit your work onto NewGrounds!
Good Luck!
Alex
There's a list of commonly used free animation programs here. Try 'em all if you like; it costs you nothing, after all. ;)
nearly all flash softwarenewgrounds wiki - animation resources this might be usefull more tutorials