All web applications run within an application pool which defines the parameters around the executable process that is used to execute the code within the web application. This is true regardless of whether you are running a standard .Net app or within SharePoint or any software.
1. Login to your Virtual Machine using Remote Desktop ( mstsc )
2. Go to "C:\os\etc\DiskSecurity" folder
3. Edit disksecurity.xml file. Add following entry at the end ( before </Entries> )
<Entry AccounType="1" Account="Psacln" Path="C:\Windows\assembly" AceFlags="FilesOnly" AccessMask="Read" EntryFlags="0x0" />
4. Save. And you are done