Is pxwma.dll Evil or Innocent?

I have two computers and when I run CCleaner on them, I get "missing a shared dll error" which is found in C:/WINDOWS/system32/pxwma.dll. (reg Key = HKLM\SOFTWARE\Microsoft\Windows\Current\Versions\SharedDlls) When I do a Google or Yahoo search for this missing dll, I found that it's related to Sonic/Roxio, but I don't have any programs by them. It's also called a Browser Helper, that's up to no good if it's in your Windows/system32 file. Can anyone tell me what to do about this missing .dll file? Thanx to all....sealevel