Hard disk space being eaten up magically?

My other laptop's Hard disk space is magically reducing. This is what happened:

C drive space before installing Roller Coaster Tycoon 3: 15.8 GB.

C drive space after uninstalling Roller Coaster Tycoon 3(Yes, I played it for only 5-10 minutes and no save game or settings): 15.2 GB (should have been 15.8GB, right?)

I restarted my computer but the space was still 15.2 GB and not 15.8 GB. So, I thought maybe some files are resting in Temp folder. So I deleted all the Temp files(total 7-8MB). To my surprise, the space in C drive was further reduced to 15.1GB!

Finally, I tried the bult-in defragment and I lost 1.1GB :(

Now, my final C drive space is 14GB, and I am wondering where did the 1.8 GB went.

There is no virus, I never run inteet on that laptop and whatever I install goes through this laptop which has antivirus and anti-malwar running.

I tried seeing if there were any unnecessary files in the Local and Roaming folder. But there was none.

No System Restore Point enabled. I restarted my computer 2-3 times, but nothing happens :(

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