hiberfil.sys : is a file used by windows when you choose to 'Hibernate' the system. You can delete it, if you won't use the Hibernate option.
pagefile.sys : is the file used by windows to be
your Page File, or your virtual memory swap. If you have 1 GB of RAM and
want to use 2 GB as your memory, windows will create a 1 GB virtual
memory in your HD and use it as needed.
Can you delete them? Yes, but not simply going to
the Windows Explorer and removing them. Take a look at the provided
links, or do some research about your windows version, to know how to
delete them.
Notice that simply deleting them is not enough: you'll have to
disable the hibernate option and the virtual memory use of your windows.
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Hiberfil.sys, as the name suggests, is the file to which Windows saves
the snap shot data. Thus, the file is always equal in size to the
total amount of available RAM on the computer.
To remove the file and disable hibernation.
1.Open a command prompt with administrative privileges.
2.Enter “powercfg.exe -h off”.
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You’re no doubt reading this article because there’s a gigantic
hiberfil.sys file sitting in the root of your drive, and you want to get
rid of it to free up some space… but you can’t!
Luckily, you actually can delete it, and today we’ll show you how.
The more memory you have in your PC, the bigger the file will be.
So What is hiberfil.sys Anyway?
Windows has two power management modes that you can choose from: one
is Sleep Mode, which keeps the PC running in a low power state so you
can almost instantly get back to what you were working on. The other is
Hibernate mode, which completely writes the memory out to the hard
drive, and then powers the PC down entirely, so you can even take the
battery out, put it back in, start back up, and be right back where you
were.
Hibernate mode uses the hiberfil.sys file to store the the current
state (memory) of the PC, and since it’s managed by Windows, you can’t
delete the file.
So if you never use it, and want to disable Hibernate mode, keep
reading. Personally I stick with Sleep Mode the vast majority of the
time, but I do use Hibernate quite often.
Disable Hibernate (and Delete hiberfil.sys) in Windows 7 or Vista
You’ll need to open an administrator mode command prompt by
right-clicking on the command prompt in the start menu, and then
choosing Run as Administrator. Once you’re there, type in the following
command:
powercfg -h off
You should immediately notice that the Hibernate option is gone from the Shut down menu.
You’ll also notice that the file is magically gone!
Disabling Hibernate Mode in Windows XP
It’s a lot easier in Windows XP to get rid of Hibernate mode… in fact, we’ve already covered it before, but we’ll cover it again. Just head into Control Panel –> Power Options, and then find the Hibernate tab.
Uncheck the box, reboot your PC, and then you can delete the hiberfil.sys file
If you use the rulers you will immediately notice a difference: 
