Computer freezing then slow?

Im new into computers so i don't know much except that it was running fine yesterday until i installed a game... After i installed it i turned off my computer and didn't use it till the next day. When i logged in everything was fine until a few minutes in 1-5 my computer randomly frozed and this happened over and over again and i had to restart my comp everytime by the button on the box. I then rebooted my comp into safety mode and deleted and uninstalled the game and restarted my comp. Now it doesn't freeze anymore but it lags like hell (Softwares take long to load up, slow speed)... Can anyone please help me ? I'm not sure if its a virus or not cause i have an anti-virus so it should tell me but does anyone have any idea..?
 
Where did you get the game, was it from an official source or a P2P download?

You could try System Restore to take it back before you installed the game.

Please post what version of Windows you are using.
 
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