dont know where i would post this but

i delete the original windows xp theme, I still have the logon page where I can click which account to go onto and it still is windows XP, but the start bar is different. Do you know how i can get it back?

system restore your computer back to the day before or a week before you deleted the theme.

that might work.

i deleted it a long time ago x(

Probably the only way to get it back is to reinstall Windows.

is there any way I can do that, but without deleteing everything on my computer?

Yes, you should just be able to pop in the CD and run the installer. It will ask you to reboot and whatnot, but you should be able to re-install Windows without erasing everything.

Granted, it won't be a "clean install", but it should at least fix your problems with the themes.

Basically, just pop in your XP CD. It will auto-run and prompt you for tasks to do. Select Install (or Reinstall) and just follow the on-screen directions after that.