Help Works Few Days Then Goes Bad

Ok so my computer works fine for a few days lik 5-10 and then when i boot it back up it runes fine for about 2 seconds logs in and everything than starts going super slow and i cant open programs or anything,

Specs:

Video Card: AMD Radeon HD 7850 - 2GB
MotherBoard: Gigabyte GA-Z77-D3H -- 1x PCI-E 3.0 x16, 4x USB 3.0-
Memory: 16 GB [4 GB X4] DDR3-1600 Memory Module-Corsair or Major Brand