System Recovery and Recovery Media

[cak]

I have a Mini nb205.  Suddenly I have no wireless network.  The message is "wireless network unavailable."  After trying everything possible, I finally tried to restore my computer to an earlier date with no luck.  I have even tried it in safe mode and the message I get is "Restoration incomplete your computer cannot be restored to..."  No matter what date I choose.  I get the same message.  What could possibly be the problem.   Thank you.