My C drive is constantly being filled up by something

[smartalecc5]

I frequently got the C: is low on disk space yellow bubble in the bottom right corner. I checked my C: drive and I had 0 bytes free. Yes, 0. So I deleted a 1 gb video. I come back on the computer next morning and the pop up message is there again. I check C: drive, and it has 0 bytes free again! What?! So I delete about 150 mb of programs and leave the computer. Come back 2 hours later, and once again, C drive is 100% full. I ran spyware, adware, and virus check and there were no viruses and only tracking cookies found by the spy/adware programs.

So once again, I am 0 free space on my C drive and I have no idea why all of my space keeps disappearing. What is going on and what can I do?

Thanks