Have you tried to sync your iPad since you installed iOS 4.2.1? Also, you may need to reboot your iPad by holding down the Home button and then holding down the Sleep/Wake button at the same time until you see the grey Apple logo. Let go of the buttons and let it restart normally.
Hi thank you for all that, all of them are on here but they've gone back to their old versions when i first purchased them but on iTunes and on my iPad they say that they're all up to date I don't know what's going on xxx