Lenteur internet et spyware

Bonjour,

Des fenêtres indésirables s'ouvrent sur mon ordinateur lorsque je suis dans Internet, de plus Internet est très très lent.......
J'ai effectué des analyses avec AVG anti spyware et Ad-Aware : aucun spyware ....
J'ai effectué une deuxième analyse avec Défenza.. qui trouve 2 infections :
melkosoft c:/windows/system32/sysmain.dll
pc tattletale c:/windows/system32/winload.exe

Plus exactement :

Melkosoft
File C:\Windows\System32\sysmain.dll
ID: 15159
Name: Melkosoft
Category: Adware (General)
ThreatType: Adware
DescriptionShort:
Author: Melkosoft Corporation
AuthorURL:
ThreatLevel: 3
AdviseDetails: This is an elevated risk threat and should be removed or quarantined as it may compromise your privacy and security, make unwanted changes to your computer's settings, and negatively impact your computer's performance and stability.




PC Tattletale
File C:\Windows\System32\winload.exe
ID: 29289
Name: PC Tattletale
Category: Commercial Key Logger
ThreatType: Surveillance Tool
DescriptionShort: PC Tattletale's Advanced Keystroke Logger records all keystrokes - Including passwords, "hidden characters" and true keystrokes too. It even features to captures both in AND outbound mails
Author: Cyber Samurai Marketing, Inc.
AuthorURL: pctattletale.com/download.htm
ThreatLevel: 3
AdviseDetails: This is an elevated risk threat and should be removed or quarantined as it may compromise your privacy and security, make unwanted changes to your computer's settings, and negatively impact your computer's performance and stability.


Que puis-je faire ?

Supprimer les fichiers sysmain.dll et winload.exe ?

Merci de me conseiller