Ich kann keine Programme mehr öffnen

check your account to confirm your subscription is active and to verify your adobe id, https://account.adobe.com

then sign out and then back in to your cc desktop application using the same adobe id used to verify your subscription: http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html

Yes

@Johanna32510091sznf 

do you had an education license?