Corrupt downloads

I've been having issues with Windows becoming corrupt ever since a few months after I built it. Originally when I first built the PC, I was using a 1 TB Seagate Hard Drive that later had corruption issues and eventually died. Usually, I would be able to use Windows for about a week before it...

Hardware : Asus M5A99X EVO R2.0 AMD FX8350 with CoolerMaster Hyper 212 EVO dual-fan Ballistix 8GB x2 Samsung 120GB SSD WD Blue 1TB EVGA GTX760 2GB Dual-ACX cooler Corsair CX600 CoolerMaster Sickleflow LED 120mm x2 Generic 120mm + 80mm x2 CoolerMaster HAF XB windowed Problem : CPU led will...

So, the problem is that the disk usage on my pc shows 100%, and that it slows down pretty much everything: scrolling, moving the cursor around, video games, etc. The kicker. My pc is used by my siblings every so often, and one of them accidentally downloaded a supposed flash game. I noticed...