I want to burn a cd

Hello, i have a toshiba laptop and i'm trying to burn a cd from iTunes, but when i select the playlist to burn, itunes says the disc burner or software is not found. i've most definately burned a numerous amount of cds in the past but recently i am running extremely low on storage space on my laptop because i desperately need an external hardrive to backup. anyways, in an effort to free up space i had one night uninstalled programs and what not, and i fear i may have unistalled the disc burn software unintentionally. that is the only thing i can think of bc like i said, i have most definitely burned cds in the near past. so i guess my question is, how do i get a hold of disc burning software? or is there a way to maybe reconnect the software that i may have on my laptop back to itunes or whatever. i am extremely confused as to what i may have done. have a feeling i had no business deleting programs in the first place. ever since then, my computer has been acting up somewhat. help please =(

rachel