The folder you are looking at is where Windows stores files in order to protect itself from bad users and bad programs and enforce the kind of user segregation and security that has been the birthright of every other multi-user operating system.
What happens is that when a user or program tries to write to a bunch of protected system directories (like
Program Files or even
C:\) Windows itself will catch that file write and will instead put the file in this VirtualStore directory so that it is not seen by other users of the computer and therefore this file also cannot compromise filesystem or even system security.
If you really want to delete that file then chances are you need to actually go into your
C:\Windows\System32 directory, sort files by size, and delete the file from there.
If you can't find the file there then yes, deleting it from the
VirtualStore folder shouldn't cause a problem. The filename suggests it is a part of a multipart RAR archive, just delete it if you don't know what or where the other parts are.