I have loaded Windows 7 onto my laptop, previously it was running Vista. My computer has been acting funny shortly afterward. Things like losing internet connection, slow loading of internet browser, not reading the cd/dvd drive, unable to play movies more than a few minutes, etc. The weird thing is when i go to computer it still says i'm running Vista. Someone has told me it might not be a virus, but the laptop is not changed over to windows 7. What can i do?