运行Hijackthis，把下面的选中打上钩，修复
O2 - BHO: YDragSearch - {62EED7C6-9F02-42f9-B634-98E2899E147B} - C:\PROGRA~1\Yahoo!\ASSIST~1\Assist\YDRAGS~1.DLL (file missing)
O2 - BHO: perfdp - {995FF616-7583-4D6B-9675-EED24EDC93BB} - C:\WINDOWS\system32\perfiup.dll
O2 - BHO: DDOC - {A64E86D2-203D-4145-AA9B-2425BAF568E9} - C:\WINDOWS\system32\henroer.dll
O2 - BHO: 卡卡上网安全助手 - {AFF6E516-CBE5-4F8A-9C2F-38A68013E766} - C:\WINDOWS\system32\kakatool.dll (file missing)
O3 - Toolbar: 卡卡上网安全助手 - {DB9ECD4F-FB8F-4311-B3CE-90B976C2707C} - C:\WINDOWS\system32\kakatool.dll (file missing)
O16 - DPF: {F138084D-84D7-48CD-BEA8-04772457516E} (VqqSpeedDlProxy Class) - http://59.36.97.38/jsxz/vqqsdl1009.cab