Get Rid Of PUSHERISM.COM from Windows 2000

More error whic PUSHERISM.COM causes
Error 0x80070103, 0x00000122, Error 0x80072EE2, 0x8024D002 WU_E_SETUP_INVALID_IDENTDATA Windows Update Agent could not be updated because the wuident.cab file contains invalid information., 0x000000F7, 0x80244033 WU_E_PT_ECP_FAILURE_TO_EXTRACT_DIGEST The file digest could not be extracted from an external cab file., 0x00000011, 0x80240025 WU_E_USER_ACCESS_DISABLED Group Policy settings prevented access to Windows Update., 0x0000005E, 0x000000D0, 0x80244027 WU_E_PT_NO_AUTH_PLUGINS_REQUESTED The server returned an empty authentication information list., 0x80248018 WU_E_DS_SESSIONLOCKMISMATCH A table was not closed because it is not associated with the session., 0x00000106, 0x00000072