AVG Anti-RootKit

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I used AVG Anti-RootKit and it found a rootkit, but the its located in C:/WINDOWS/SYSTEN32/kdvru.exe. It says I canrome it but does that mean I just remove the rootkit or the whole file? I know SYSTEM32 is a major file so I'm not sure what to do. I don't want to mess up the computer. Also I had Spyware Doctor 3.5 Free Edition, but I went to update it and now it doesn't scan it just sheild trojans I guess, it upgraded to version 5.0. If any one knows where to get a free edition of Spyware Doctor, even if its just 3.5. I have searched and the only ones I can find are the ones that are FREE TO TRY not the FREE ones. Thanks