Cant run a full system scan

 

I was playing a game overnight (around 8-12 PM) and i downloaded a file for the game (a exe and a dll) then NIS told me it was a trojan.gen.2 i checked what it was and i restore it, after that the computer began to odd me 

 

first of all i cant run a full system scan, by that i mean it literraly wont run i click it and nothing happened i tried logging off and log in again (not restarting) and it launches the scanning window and before i could scan it says error during scan and i cant run the scan again (same as before logging in and logging off) i thought i had a virus so i run a quick scan and norton told me its safe but i still cant run full system scan i can run NRP(norton repair tool) but im to afraid to use it since of the risk and i can run custom scan and i see that full system scan is on(the check box is checked) and i try to stop it ( by unchecking the box) and run it again but still no work

 

second of all it became laggy (not that many lag) i saw one virus called msdcsc.exe i scan it with norton( found the file in temp folder) and norton removed it but it is still laggy

 

my computer is off now and im afraid to turn it on please give me a solution anything.

 

-kivlan101