Arterio, welcome to the windows 7 forum.
One thing to remember if you leave your machine on all the time is ventilation, if there is plenty of room for the fans to push their air out, then it should be ok. I always leave my server on but I periodically open it up and blow out the cpu fan so that the rug dust does not clog it up.
My laptops are only on when I use them as laptops are notorious for insufficient ventilation.
Rich