In about every thread (texture hacking) they say backup.
O well here we go.
No one will upload them they are too big. End of story.
What you need to do is Load Steam, From the Library tab, right-click on the game (mw2) and select Properties from the menu. Select the Local files tab and click the Verify integrity of game cache... button. Then wait for it to be done. If you cancel it will cancel and you'll have to do it again. Don't fuck with it while its working.
Next time backup
(PS: it might take like an hour depending on your internet speed if you really deleted everything, theres no faster way)