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ThreatExpert's Statistics for Adware:Win32/WhenU.D [Microsoft]:

Adware:Win32/WhenU.D [Microsoft] is also known as:
Threat AliasNumber of Incidents
Adware-SaveNow [McAfee]9
not-a-virus:AdWare.Win32.SaveNow.ay [Kaspersky Lab]4
not-a-virus:AdWare.Win32.SaveNow.f [Kaspersky Lab]4
Trojan.Whenu.B [PC Tools]4
Trojan.Whenu.C [PC Tools]4
Win-Trojan/Whenu.132096 [AhnLab]4
Win-Trojan/Whenu.18944 [AhnLab]4
Adware.ILookup_Begin2Search [PC Tools]1
Adware.WhenU_SaveNow [PC Tools]1
not-a-virus:AdWare.Win32.SaveNow.g [Kaspersky Lab]1
not-a-virus:AdWare.Win32.SaveNow.o [Kaspersky Lab]1

Adware:Win32/WhenU.D [Microsoft] is known to be created as:
%ProgramFiles%\weathercast\uninst.exe
%ProgramFiles%\weathercast\weather.exe
Note: %ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.