Infection de dnsapi.dll

Bonjour,
Mon ordinateur est considérablement ralenti depuis quelques jours.
J'ai effectué une analyse avec AdwCleaner mais il indique le message suivant :
[!] File not disinfected: C:\Windows\System32\dnsapi.dll
[!] File not disinfected: C:\Windows\SysWOW64\dnsapi.dll

J'ai fait plusieurs recherches, notamment sur ce forum, mais les solutions proposées sans très individualisées. Je me permet donc de poster ma question, en espérant que vous pourrez m'aider à nettoyer mon ordinateur.

Je précise qu'il s'agit d'un Toshiba Satellite C850D et que je suis sous Windows 7 64bits.

Merci d'avance

Voici le rapport d'AdwCleaner
-------------------------------------------
# AdwCleaner v6.010 - Logfile created 11/09/2016 at 18:02:09
# Updated on 12/08/2016 by ToolsLib
# Database : 2016-09-11.1 [Server]
# Operating System : Windows 7 Home Premium Service Pack 1 (X64)
# Username : Vero - VERO-PC
# Running from : G:\Documents\UTILITAIRES\adwcleaner_6.010.exe
# Mode: Clean
# Support : https://toolslib.net/forum

• • • • • [ Services ] *****
        • [ Folders ] *****
        • [ Files ] *****
        • [ DLL ] *****

[!] File not disinfected: C:\Windows\System32\dnsapi.dll
[!] File not disinfected: C:\Windows\SysWOW64\dnsapi.dll

• • • • • [ WMI ] *****
        • [ Shortcuts ] *****
        • [ Scheduled Tasks ] *****
        • [ Registry ] *****
        • [ Web browsers ] *****

[-] [microsoft-net-framework-4.fr.softonic.com] [Search Provider] Deleted: microsoft-net-framework-4.fr.softonic.com
[-] [C:\Users\Vero\AppData\Local\Google\Chrome\User Data\Default] [startup_urls] Deleted: hxxp://www.youndoo.com/?z=c5d573bcb8f50b31ce6e28egezbm2c4g9efo8qbw5o&from=amz&uid=TOSHIBAXMQ01ABD050_62DEFJ6KSXX62DEFJ6KS&type=hp
[-] [C:\Users\Vero\AppData\Local\Google\Chrome\User Data\Default] [extension] Deleted: dgpdioedihjhncjafcpgbbjdpbbkikmi
[-] [C:\Users\Vero\AppData\Local\Google\Chrome\User Data\Default] [homepage] Deleted: hxxp://search.babylon.com/?affID=112555&tt=120912_pcp_3712_4&babsrc=HP_ss&mntrId=2ca80727000000000000206a8a16c47e

:: "Tracing" keys deleted
:: Winsock settings cleared

C:\AdwCleaner\AdwCleaner[C1].txt - [2387 Bytes] - [31/05/2016 09:44:51]
C:\AdwCleaner\AdwCleaner[C2].txt - [11606 Bytes] - [16/11/2015 21:41:47]
C:\AdwCleaner\AdwCleaner[C3].txt - [881 Bytes] - [29/11/2015 12:03:57]
C:\AdwCleaner\AdwCleaner[C4].txt - [928 Bytes] - [15/12/2015 12:14:44]
C:\AdwCleaner\AdwCleaner[C5].txt - [2419 Bytes] - [04/09/2016 21:30:54]
C:\AdwCleaner\AdwCleaner[C6].txt - [5682 Bytes] - [08/09/2016 21:47:16]
C:\AdwCleaner\AdwCleaner[C7].txt - [3255 Bytes] - [09/09/2016 08:35:38]
C:\AdwCleaner\AdwCleaner[C8].txt - [3202 Bytes] - [10/09/2016 08:58:18]
C:\AdwCleaner\AdwCleaner[C9].txt - [2119 Bytes] - [11/09/2016 18:02:09]
C:\AdwCleaner\AdwCleaner[R0].txt - [42286 Bytes] - [09/01/2015 14:15:07]
C:\AdwCleaner\AdwCleaner[R1].txt - [968 Bytes] - [27/06/2015 20:40:13]
C:\AdwCleaner\AdwCleaner[S0].txt - [37933 Bytes] - [09/01/2015 14:24:39]
C:\AdwCleaner\AdwCleaner[S10].txt - [730 Bytes] - [14/01/2016 11:19:00]
C:\AdwCleaner\AdwCleaner[S11].txt - [2555 Bytes] - [04/09/2016 21:29:51]
C:\AdwCleaner\AdwCleaner[S12].txt - [5558 Bytes] - [08/09/2016 21:43:18]
C:\AdwCleaner\AdwCleaner[S13].txt - [3361 Bytes] - [09/09/2016 08:24:02]
C:\AdwCleaner\AdwCleaner[S14].txt - [3300 Bytes] - [10/09/2016 08:50:06]
C:\AdwCleaner\AdwCleaner[S15].txt - [3721 Bytes] - [11/09/2016 17:42:53]
C:\AdwCleaner\AdwCleaner[S1].txt - [4165 Bytes] - [01/03/2016 19:51:11]
C:\AdwCleaner\AdwCleaner[S2].txt - [3912 Bytes] - [06/03/2016 12:27:21]
C:\AdwCleaner\AdwCleaner[S3].txt - [2690 Bytes] - [31/10/2015 09:22:12]
C:\AdwCleaner\AdwCleaner[S4].txt - [1232 Bytes] - [14/11/2015 16:13:37]
C:\AdwCleaner\AdwCleaner[S5].txt - [11394 Bytes] - [16/11/2015 21:30:10]
C:\AdwCleaner\AdwCleaner[S6].txt - [770 Bytes] - [29/11/2015 11:51:50]
C:\AdwCleaner\AdwCleaner[S7].txt - [811 Bytes] - [15/12/2015 12:11:46]
C:\AdwCleaner\AdwCleaner[S8].txt - [716 Bytes] - [18/12/2015 15:25:23]
C:\AdwCleaner\AdwCleaner[S9].txt - [716 Bytes] - [18/12/2015 15:27:18]

########## EOF - C:\AdwCleaner\AdwCleaner[C9].txt - [3509 Bytes] ##########