Solved Sharefolder does not show in Windows 7 in Virtualbox

[newdeveloper]

Host Specification :
Ubuntu 16.04 X64

Guest Specification :
Windows 7 SP1 X64 with latest update installed.
bitdefender internet security 2016 installed.

I have installed latest version of virtualbox 5.20 and the extension pack on guest operation system(windows 7).

I want to access to shared folders on windows 7 in virtualbox but I can not and it does not show any share folder.

==> vboxshare is the sharefolder name in ubuntu.

==> I have tried in guest os in mycomputer ==> map network drive and it does not help.

==> I have tried in cmd ==> net use z:\\vboxsrv\vboxshare but it does not help.

==> I have turned on all of the setting in "Control Panel\All Control Panel Items\Network and Sharing Center\Advanced sharing settings" for both home/work and public but it does not help.

==> I have turned off the firewall of bitdefender and turned off firewall of windows but it does help.

I have read this link below to check the firewall of bitdefender setting and tried again but it does not help.

Managing connection settings

what should I do ?

Thanks for any help.

 

[newdeveloper]

Today after upgrading to VirtualBox 5.0.22 (released 2016-06-16) , the problem solved.