Sality virus is one of the viruses that infect executable (*.exe) files in the computer and in some cases also file with the extension *.com, *.dll and *.scr. When it infects a file, some viruses variant will install a helper component in the Windows System folder.
Names of this component will vary by Sality variant (source: Norman website): Syslib32.dll (All early versions) Olemdb32.dll (Sality.M, 3:03 version) Wmimgr32.dll (Sality.N, 3:04 version) Vcmgr32.dll (Sality.P / Q, version 3:07) Vcmgcd32.dll (Sality.R, 3:09 version) Wdmfmc32.dll (Sality.S, 3:07 version) If the virus has infected *.exe files in Windows System (eg explore.exe), then you will not be able to run Windows explorer and your windows will run abnormal/ unstable.