Until someone else reports this problem I'm going to declare that this is a issue with a driver on your PC, not a VirtualBox problem.
R1 ElRawDisk; C:\WINDOWS\system32\drivers\rsdrvx64.sys [26024 2009-02-12] (EldoS Corporation)
R0 VBoxGuest; C:\Windows\System32\DRIVERS\VBoxGuest.sys [164856 2016-07-21] (Oracle Corporation)
R3 VBoxMouse; C:\Windows\system32\DRIVERS\VBoxMouse.sys [129504 2016-07-21] (Oracle Corporation)
R1 VBoxSF; C:\Windows\System32\drivers\VBoxSF.sys [292728 2016-07-21] (Oracle Corporation)
R3 VBoxVideoW8; C:\Windows\system32\DRIVERS\VBoxVideoW8.sys [308784 2016-07-21] (Oracle Corporation)
S0 WdBoot; C:\Windows\System32\drivers\WdBoot.sys [44568 2015-10-30] (Microsoft Corporation)
R0 WdFilter; C:\Windows\System32\drivers\WdFilter.sys [293216 2015-10-30] (Microsoft Corporation)
R3 WdNisDrv; C:\Windows\System32\Drivers\WdNisDrv.sys [118112 2015-10-30] (Microsoft Corporation)
However it's a non-sequiter to say that "I also installed the latest Guest Additions".
each guest has to be updated separately, so there is no singular operation which updates the GAs.
========================= file: C:\Windows\System32\DRIVERS\VBoxGuest.sys ========================
File is digitally signed
MD5: E41B9116DA445C7530FFF3CF61DC3588
Creation and modification date: 2016-07-21 11:50 - 2016-07-21 11:50
Size: 0164856
Attributes: ----A
Company Name: Oracle Corporation
Internal Name: VBoxGuest
Original Name: VBoxGuest.sys
Product: Oracle VM VirtualBox Guest Additions
Description: VirtualBox Guest Driver
File Version: 5.1.2.108956
Product Version: 5.1.2.108956
Copyright: Copyright (C) 2009-2016 Oracle Corporation
====== End of File: ======
========================= file: C:\Windows\system32\DRIVERS\VBoxMouse.sys ========================
File is digitally signed
MD5: B6EE8E23068F7BB0E8E3F8D69BAB2AA9
Creation and modification date: 2016-07-21 11:49 - 2016-07-21 11:49
Size: 0129504
Attributes: ----A
Company Name: Oracle Corporation
Internal Name: VBoxMouse
Original Name: VBoxMouse.sys
Product: Oracle VM VirtualBox Guest Additions
Description: VirtualBox Mouse Filter
File Version: 5.1.2.108956
Product Version: 5.1.2.108956
Copyright: Copyright (C) 2009-2016 Oracle Corporation
====== End of File: ======
========================= file: C:\Windows\System32\drivers\VBoxSF.sys ========================
File is digitally signed
MD5: 8EB82BFA3AD36062BFBCE94216FCF966
Creation and modification date: 2016-07-21 11:49 - 2016-07-21 11:49
Size: 0292728
Attributes: ----A
Company Name: Oracle Corporation
Internal Name: VBoxSF
Original Name: VBoxSF.sys
Product: Oracle VM VirtualBox Guest Additions
Description: VirtualBox Shared Folders Minirdr
File Version: 5.1.2.108956
Product Version: 5.1.2.108956
Copyright: Copyright (C) 2009-2016 Oracle Corporation
====== End of File: ======
========================= file: C:\Windows\system32\DRIVERS\VBoxVideoW8.sys ========================
File is digitally signed
MD5: 1C1715C2F2929BD6FF2311A936AE3713
Creation and modification date: 2016-07-21 11:50 - 2016-07-21 11:50
Size: 0308784
Attributes: ----A
Company Name: Oracle Corporation
Internal Name: VBoxMPW8
Original Name: VBoxVideoW8.sys
Product: Oracle VM VirtualBox Guest Additions
Description: VirtualBox Video Driver for Windows 8
File Version: 5.1.2.108956
Product Version: 5.1.2.108956
Copyright: Copyright (C) 2009-2016 Oracle Corporation
====== End of File: ======
========================= file: C:\Windows\System32\drivers\WdBoot.sys ========================
File is digitally signed
MD5: 069D3D6E20AD753B34FCE856F0436869
Creation and modification date: 2015-10-30 03:17 - 2015-10-30 03:17
Size: 0044568
Attributes: ----A
Company Name: Microsoft Corporation
Internal Name: WdBoot
Original Name: WdBoot.sys
Product: Microsoft® Windows® Operating System
Description: Microsoft antimalware boot driver
File Version: 4.9.10586.0 (th2_release.151029-1700)
Product Version: 4.9.10586.0
Copyright: © Microsoft Corporation. All rights reserved.
====== End of File: ======
========================= file: C:\Windows\System32\drivers\WdFilter.sys ========================
File is digitally signed
MD5: E3E97151A1D1E87BB2D5371F66C5F169
Creation and modification date: 2015-10-30 03:17 - 2015-10-30 03:17
Size: 0293216
Attributes: ----A
Company Name: Microsoft Corporation
Internal Name: MpFilter
Original Name: MpFilter.sys
Product: Microsoft® Windows® Operating System
Description: Microsoft antimalware file system filter driver
File Version: 4.9.10586.0 (th2_release.151029-1700)
Product Version: 4.9.10586.0
Copyright: © Microsoft Corporation. All rights reserved.
====== End of File: ======
========================= file: C:\Windows\System32\Drivers\WdNisDrv.sys ========================
File is digitally signed
MD5: 07B043160399AF4009054E2EA3464BF4
Creation and modification date: 2015-10-30 03:17 - 2015-10-30 03:17
Size: 0118112
Attributes: ----A
Company Name: Microsoft Corporation
Internal Name: NisDrvWFP.sys
Original Name: NisDrvWFP.sys
Product: Microsoft® Windows® Operating System
Description: Microsoft Network Realtime Inspection Driver
File Version: 4.9.10586.0 (th2_release.151029-1700)
Product Version: 4.9.10586.0
Copyright: © Microsoft Corporation. All rights reserved.
====== End of File: ======
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