i just recently purchased a new computer and i plugged my ipod into it and i tried to sync some new music i downloaded and it said id have to delete all the songs already on there. and i cant do that do to all the songs are on the old computer.

Welcome to iLounge.

I recommend reading this detailed article on how to copy your music over to this new computer.

If you want, you can click on Cancel for that sync job. Then check the box in iTunes to have your music manually managed. That should allow you to add those new songs manually to the iPod.