Open an new file

We installed the official version of Photoshop on a new laptop... on the old one, windows, it worked perfectly. Installing it on the new laptop was no problem at all, we logged in and all, but no matter what we trie, Photoshop doesn't work, it won't open a new file or an exisiting one, nothing... but we get no error-codes either. Any ideas about solving this? It's needed desperately for art-classes