Warning!
According to the folks at MSMVPS, ‘Winfixer’ & ‘Errorsafe’ is being distributed by MSN messenger banner advertisements. See this link for more info:
http://msmvps.com/blogs/spywaresucks/archive/2007/02/18/591493.aspx
So far, avast is not detecting this file as malware (scroll down in that link above to see results at VirusTotal). I sent an email to ‘virusavast.com’ with this info. Hopefully this is correct. But… since this malware is not a virus but spyware, I suppose avast may not ever detect these.
But I’d be careful about using MSN messenger until MSN clear this up.