Cry Tap-2 virus, Help?

so yeah i have a virus. the infected file is called yayXQiGw.dll C:\WINDOWS\system32\yayXQiGw.dll i can't delete it and on top of that i cant connect to the internet. this happened when my brother was given a message to download a codec to play a vid and when he did this happened. my... show more so yeah i have a virus. the infected file is called yayXQiGw.dll

C:\WINDOWS\system32\yayXQiGw.dll

i can't delete it and on top of that i cant connect to the internet. this happened when my brother was given a message to download a codec to play a vid and when he did this happened. my connection says Limited or no connectivity.
Update: sorry i dont have access to this laptop that much and like i said my comps internet aint working.
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