anthonrydonohue
go to the library and get the potions book. the book is in the restricted section in either the last or second to last bookshelf to the left. read it and go back to snape.
Gregersu, not everyone is willing to fight you. point it at a slytherin!
Charjman, The PSP version of the game is way different than the other consoles. There is an Individual thread for that. Heres the link.
Scotsman, you're basicly done with the game. Check the Marauder's Map and check which rooms you have to discover 100%.
Julius, I can't help you with that. Put the game in the CD-R Drive, Go to the Start tab, Click Run ( it's on the right) go to browse, click the tab on the left that says my computer, and then lastly click on CD-RW Drive. and Run that. If that doesn't work, then I don't know what to tell you.
Krishh05, the last item is probably in the Entrance Courtyard under a pile of leaves. WGL the broom and levitate it over the leaves. IF not there, check the Clocktower courtyard. IT is right in front of the fountain.