So my computer isn't even a year old and its already acting like its 7 years old

Ko lags evrytime i log in, and its not the in server lag where its like 2 second lag, its like it stops every minute for about 10 seconds and i wont be able to do shit like that in new server.
And all of a sudden, the graphics on knights online totally got fuked up, and its like my graphix card broke? I dont no anything about comps so i need help. Should i get a pro in here? Or do i have a virus? And no...i dont dl porn...