I have a problem with my computer. I try to use the internet and I cannot. I tried to check the D drive and it say's that the file is corrupted. I tried to use cmd and the screen blinks for a second and it just disappears. I cannot use the cd/dvd drive either becauses it refuses to even play songs or watch movies. I thought it could be a virus so I decided to buy an antivirus but since I cannot access the internet or run the  CD, what could be the problem wih my desktop???