Windows 7 services terminate unexpectedly

I'm running Windows 7 Pro 64-bit and recently started to have problems with my sound and network connection. According to the logs, the following four services keep on terminating at random times, but they all terminate at the same time. Reinstalling Windows did not help.

• The TCP/IP NetBIOS Helper service terminated unexpectedly. It has
  done this 10 time(s).


• The Windows Event Log service terminated unexpectedly. It has done
  this 10 time(s).


• The DHCP Client service terminated unexpectedly. It has done this 10
  time(s).


• The Windows Audio service terminated unexpectedly. It has done this
  10 time(s).