System File Checker: The savior for Windows 7 and 8
When a Windows 7 or Windows 8 starts to behave weirdly, this is the general-purpose command that can save your day (in the Command Prompt):
sfc /scannow
It scans all system files and fixes whatever looks bad. In my case, it started off as a “Limited” Wireless connection on a laptop (after it had been fine for a year), which turned out to be the lack of a DHCP request, and ended up with the understanding the the DHCP request service can’t be started because some “element” was missing. Now go fix that manually.
The scan took some 30 minutes, but after the reboot, all was fine again.
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