антивирус symantec стоит?
если да то:
1. Click Start > Run
2. Type in: regedit and click OK
3. Navigate to:
"HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\AV\Storages\Filesystem\RealTimeScan" (32 bit Operating System) or
“HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec Endpoint Protection\AV\Storages\Filesystem\RealTimeScan” (64 bit Operating System)
4. Click Edit > New > DWORD Value
5. Name the new value: DeferredScanning
6. Open DeferredScanning
7. In the Value data field add “0” (1 = on, 0 = off)
8. Click OK
9. Close the Registry Editor window.
взято с support.symantec.com/en_US/article.TECH196178.html