Salut Bralci,
Tu peux fixer ceci:

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iehome&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iehome&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iehome&locale=FR_FR&c=Q105&bd=pavilion&pf=desktop
O2 - BHO: URLLink Class - {4A2AACF3-ADF6-11D5-98A9-00E018981B9E} - C:\Program
O4 - HKLM\..\Run: [WhenUSave] C:\Program Files\Save\Save.exe Files\NewDotNet\newdotnet6_38.dll
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\OFFICE11\REFIEBAR.DLL


Telecharge ceci puis fait un scan avec chacun :

A²free (scanneur de Trojans ):
a² free

Spybot:
Spybot Search & Destroy

Ad-aware:
Ad-aware

Puis remet un rapport Hijack s'il te plait.