Event Log, Audio Output, And Screensaver

I recently turned my computer (HP Pavilion Verde Special Edition a6645f) on after 4 days of dormancy. It runs Windows Vista. When it turned on, it told me it "could not connect to windows services," and that I should check the system event log. I tried, and it said the log is unavailable and to make sure it is running. Also, my sound has vanished. It is telling me, "No Audio Output Devices are installed." On top of that, my wireless internet is failing. It tells me that my wireless adapter (D-Link Rangebooster G Desktop Adaptor) is not available, even though when the computer starts, the LED on the adapter lights, then goes out......