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Windows 8.1 on Virtualbox does not show shared folders after upgrade - Solution

Hey Guys, Its been a long time i wrote in my blog. I thought this one needs a post so that some one like me struggling can solve this issue.

Here is my scenario. I had a Windows 8 virtual machine (Virtualbox) as a guest OS on my Windows 7 machine. Yesterday , i upgraded this to Windows 8.1. After restart, i could not see any of my shared folders from my windows 7 machine on Windows 8.1.

Solution: 

The quick solution was to rerun the Virtualbox guest additions. 

Moral , After the upgrades it is better to rerun the guest additions. I used to do it on my linux VMs.Normally, i see the screen size issue after the upgrade.I would then know i have to rerun the guest additions but on Windows i did not see the screen issue. So, it did not strike me till i hit the problem of not finding the shared folder.