<human>: Ok, perhaps a little over dramatic, but I've been plagued by a mystery problem for a few weeks now, and it's starting to drive me crazy.

I run Windows Vista Home Premium (I know, I know, it's only temporary) on a Lenovo G530 with a 221 GB hard drive. Now Windows Explorer is telling me that I've used 180 GB of this space, and I know it is lying to me. I've only used 77 GB of the space.

Now let's clear a few things up right away. **Here is what I've done:**

* I've run a virus scan and a spyware scan. My computer is clean - even though I'm a Windows user, I take good care of my machine. 

* I ran TreeSize, which totally has my back and told me I'm using 77 GB, all of which I can account for.

* Even so, I ran CCleaner just in case, but it didn't turn up anything new.

* I know Windows Vista runs a backup shadow copy. I used the command prompt to find out how much space it was allocating. It told me about 33 GB. I've heard the default amount is generally 15% of your hard drive, so this makes perfect sense.

However, if you add the space allocated for the backup shadow copy to what TreeSize says I'm using, the total is still only 110 GB. Windows is telling me that 180 GB are being used.

And I can't figure out why.

The only lead I've got is something I heard floating around on message boards about Vista making several shadow copies. However I have no idea how to check and see if this is the case, but it may explain the 70 GB that are unaccounted for.

Reddit, you guys have always been awesome: please, if you have any ideas, take a minute out of your day to help me out. It's really bugging me that I can't figure this out on my own.

Summarize the given text in a few sentences.
<bot>: Vista is fucking with my mind, and despite all my efforts, I can't figure out where my missing hard drive space is being used.