Keep Computer Off Carpet
Not only is no longer on the carpet but you can now easily wheel it out and back in when you need to clean around it upgrade plug or unplug peripherals.
Keep computer off carpet. Your computer would be at the most risk of static damage when you place it on the carpet move it on the carpet or pick it up off the carpet. Bought some lexan and i have. You can buy rolling stands for precisely this purpose that also make it easier to move your desktop around. A pc caddy will get your tower up off of the messy carpet keep it under the desk out of site and fans out of earshot a bit while being movable to allow for access to the back if necessary.
If you don t want to stand it on the carpet and don t have a desk a cheapo solution is just to buy a small sheet of hardboard and stand it on that. This is what i do. A great thing you can is get a board with wheels on it from your local gardening hardware store and put the pc on that. As stated in the other answers dust at the floor.
If the carpet is a problem consider putting it on a platform or stand on the carpet. Here s a few of the better computer stands that will do the job for you.