process with no name it taking 50% of cpu

Solution
There's an interesting bit in that article about memory leaks:

Svchost.exe (netsvcs)[edit]
Netsvcs is a sub process used by svchost.exe (netsvcs).[8] If and when there is a memory leak the svchost.exe consumes and hogs the CPU. This issue occurs because a handle leak occurs in the Winmgmt service after installing Windows Management Framework 3.0 on the computer.[9] The Winmgmt service is the Windows Management Instrumentation (WMI) service within the svchost.exe process that is running under the LocalSystem account.

So it looks t me like your system has a rogue application-read something possibly nasty-running.
Usual rules apply:

Clear out the crud: Ccleaner is excellent for this as a lot of minor league problems lurk in the various...
There's an interesting bit in that article about memory leaks:

Svchost.exe (netsvcs)[edit]
Netsvcs is a sub process used by svchost.exe (netsvcs).[8] If and when there is a memory leak the svchost.exe consumes and hogs the CPU. This issue occurs because a handle leak occurs in the Winmgmt service after installing Windows Management Framework 3.0 on the computer.[9] The Winmgmt service is the Windows Management Instrumentation (WMI) service within the svchost.exe process that is running under the LocalSystem account.

So it looks t me like your system has a rogue application-read something possibly nasty-running.
Usual rules apply:

Clear out the crud: Ccleaner is excellent for this as a lot of minor league problems lurk in the various .temp folders and internet caches dotted throughout Windows.
Get more serious:
Run anti malware then anti virus sweeps.
 
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