VirtualBox non funziona

[Piero]

ho effettuato una pulizia con CCleaner e non riesco a fare ripartire VirtualBox. Il log che esce è: VirtualBox COM Server 5.2.16 r123759 win.amd64 (Jul 16 2018 15:52:14) release log 00:00:00.015619 main Log opened 2018-07-26T11:32:49.851605900Z 00:00:00.015619 main Build Type: release 00:00:00.015619 main OS Product: Windows 10 00:00:00.015619 main OS Release: 10.0.17134 00:00:00.015619 main OS Service Pack: 00:00:00.031240 main DMI Product Name: System Product Name 00:00:00.031240 main DMI Product Version: System Version 00:00:00.031240 main Host RAM: 4016MB (3.9GB) total, 1812MB available 00:00:00.031240 main Executable: C:\Program Files\Oracle\VirtualBox\VBoxSVC.exe 00:00:00.031240 main Process ID: 13232 00:00:00.031240 main Package type: WINDOWS_64BITS_GENERIC 00:00:00.031240 VirtualBox: object creation starts 00:00:00.046862 Home directory: 'C:\Users\piero\.VirtualBox' 00:00:00.046862 Installed Drivers: 00:00:00.046862 C:\WINDOWS\system32\DRIVERS\VBoxNetLwf.sys (Version: 5.2.16.23759) 00:00:00.046862 C:\WINDOWS\system32\DRIVERS\VBoxUSBMon.sys (Version: 5.2.16.23759) 00:00:00.046862 C:\WINDOWS\system32\DRIVERS\VBoxDrv.sys (Version: 5.2.16.23759) 00:00:00.046862 C:\WINDOWS\System32\drivers\VBoxNetAdp6.sys (Version: 5.2.16.23759) 00:00:00.062483 Loading settings file "C:\Users\piero\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:00.062483 Getting USB descriptor failed with error 31 00:00:00.078104 USB: Unknown USB device detected (idVendor: 0x0a5c, idProduct: 0x21ec) 00:00:00.171832 HostDnsMonitor: old information 00:00:00.171832 no server entries 00:00:00.171832 no domain set 00:00:00.171832 no search string entries 00:00:00.171832 HostDnsMonitor: new information 00:00:00.171832 server 1: 192.168.1.1 00:00:00.171832 domain: station 00:00:00.171832 no search string entries 00:00:00.171832 HostDnsMonitorProxy::notify 00:00:00.203076 SUPR0QueryVTCaps -> VERR_VMX_MSR_ALL_VMX_DISABLED 00:00:00.250013 VD: VDInit finished with VINF_SUCCESS 00:00:00.250013 Loading settings file "C:\Users\piero\VirtualBox VMs\Windows Xp\Windows Xp.vbox" with version "1.15-windows" 00:00:00.265565 VirtualBox: object created 00:00:01.653184 Saving settings file "C:\Users\piero\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:01.663208 Saving settings file "C:\Users\piero\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:05.471174 Load [C:\Program Files\Oracle\VirtualBox\ExtensionPacks\Oracle_VM_VirtualBox_Extension_Pack\win.amd64\VBoxHostWebcam.DLL] rc VINF_SUCCESS 00:00:05.714537 ERROR [COM]: aRC=VBOX_E_IPRT_ERROR (0x80bb0005) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={Saved screenshot data is not available (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=0 01:21:15.783203 USBPROXY Getting USB descriptor failed with error 31 02:59:48.161337 MainPower Host suspending: Paused 1 VMs 03:01:39.953430 MainPower Host resumed: Resumed 1 VMs 03:01:41.573588 dns-monitor HostDnsMonitor: old information 03:01:41.573588 dns-monitor server 1: 192.168.1.1 03:01:41.573588 dns-monitor domain: station 03:01:41.573588 dns-monitor no search string entries 03:01:41.573588 dns-monitor HostDnsMonitor: new information 03:01:41.573588 dns-monitor no server entries 03:01:41.573588 dns-monitor no domain set 03:01:41.573588 dns-monitor no search string entries 03:01:41.573588 dns-monitor HostDnsMonitorProxy::notify 03:02:05.331431 USBPROXY Getting USB descriptor failed with error 31 03:02:05.332406 USBPROXY USB: Unknown USB device detected (idVendor: 0x0a5c, idProduct: 0x21ec) 03:02:05.896003 dns-monitor HostDnsMonitor: old information 03:02:05.896003 dns-monitor no server entries 03:02:05.896003 dns-monitor no domain set

Ho provato anche a fare la riparazione reinstallando il programma ma non funziona ugualmente. Qualcuno mi può aiutare? Ringrazio. Piero