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Usually, normal, hardware switches tend to have a default (implicit!) deny at the end of ACLs, so in if that was the case for the distributed virtual switch as well and you would turn on filtering on a port group, you might seriously harm your existing infrastructure as you would drop all traffic that wouldn't have any explicit allow statement. Thank you for finding out about the default allow.
On Linux, the box would typically be in ~/.vagrant.d/boxes. So you can do mv ~/.vagrant.d/boxes/<badname> ~/.vagrant.d/boxes/<goodname> EDIT: Sorry, didn't catch the note in the parenthesis, I will leave the duplicate here anyway, since it is visually clearer for me and maybe others as well.
Really, try the Ubuntu way, that way You can at least save your data (like copy them to a USB hard disk or something). If you have the capacity, You can actually save a copy of the C: partition using dd so You can browse it later in case You missed something. Let me know, if this is interesting for You. After that, you will probably have to reinstall - I know, that is very inconvenient. While You are at it, consider upgrading to an SSD, if You haven't one already.
Please, see my updated answer and maybe remove the down vote, if it was You. I tried to actually inform You, there is much more to read up on, when You are serious about storage and offered some tips on backup as well.
Thank You for Your time and thought. Please read the question again "I want to access D-Link DIR-600L wireless router via terminal. Can i do this by opening telnet port. [Grammatically, here should be a question mark.]" -> My answer to what the user wants to do is don't, you will hurt yourself and possibly others. Then I offer an overall better solution - SSH and possibly OpenWRT, which also puts you in control of your device. This is what I think the user actually wants.
@miroxlav This is why I do hardware burn in before I start using it seriously or at least make sure, the whole device is under NBD warranty so I get a replacement on time, while using some backup laptop or desktop. It helps a lot, when you have a good backup, automated bootstrap and a few devices you can stand in extended use with a modern web browser and many tabs open :-)