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If you are sure they were working yesterday then roll your system back to a day before yesterday by using System Restore. System Restore will allow you to select a Restore Point (date and time) before you started having the problem. System Restore does not delete your data, documents, music, pictures, videos or programs (unless the program was installed after the restore point you selected). Click Start/Program or All Programs. Click Accessories/System Tools/System Restore. In windows 7 just click Start and in the search box type: System Restore then look up at the returned search results and click on System Restore.
System Recovery on the other hand will delete everything and set your system back to when you first purchased it.