[SOLVED] App Store doesn't work, but iCloud does somehow..

Hey,
after a few days my Hackintosh seems to work properly..
But I can't login to the AppStore and I can't use FaceTime and iMessage either.
And there upon I can't load unsigned kexts..

Can someone help me?
My specs are:
P5G41-m lx mainboard
Gts 250
Intel Pentium E5400
2Gb Ram
EDIMAX EW-7811UN WLAN USB adapter