The threat level for Win32.Nimnul.a is "severe". May want to check your entire computer as the source of the infection may not be the DLL.
You can find more info at http://www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=Virus%3aWin32%2fRamnit.N
(or cached version: http://cc.bingj.com/cache.aspx?q=Kaspersky+-+Virus.Win32.Nimnul.a&d=4841593599298121&mkt=en-US&setlang=en-US&w=BiouqfjHjwWZs5sowSswoCERdwy7qKJd)
You can find more info at http://www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=Virus%3aWin32%2fRamnit.N
(or cached version: http://cc.bingj.com/cache.aspx?q=Kaspersky+-+Virus.Win32.Nimnul.a&d=4841593599298121&mkt=en-US&setlang=en-US&w=BiouqfjHjwWZs5sowSswoCERdwy7qKJd)