Starting yesterday, every few minutes a message comes up that windows explorer has stopped working, then restarts. I've run a sfc /scannow (cbs.log below). Within the cmd.exe it says that "Windows Resource Protection found corrupt files but was unable to fix some of them".
I've run a dskchk /f which did not resolve the issue.
I've run malwarebytes (free version) which found no issue.
In safe mode the popup doesn't appear, but the start and shortcut bar flickers out for a few seconds and returns, similar to in regular mode.
Event view explanation of one of the messages:
Faulting application name: Explorer.EXE, version: 6.1.7601.17567, time stamp: 0x4d672ee4
Faulting module name: ntdll.dll, version: 6.1.7601.18205, time stamp: 0x51dba4e7
Exception code: 0xc0000005
Fault offset: 0x0000000000018e5d
Faulting process id: 0x814
Faulting application start time: 0x01cea168f478ee08
Faulting application path: C:\Windows\Explorer.EXE
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: 7e57ce7f-0d5c-11e3-b779-6cf049e91e5a