For the love of God, IT WORKED!! IT ACTUALLY WORKED!! After running Zoek, I opened both IE and Chrome browsers and they still showed the annoying Yahoo homepage. Then I changed the settings in both browsers to my desired homepage, and restarted. I couldn't believe it, my changes weren't overwritten anymore!!! I am truly grateful for that TwinHeadedEagle, thank you SO, SO, SO MUCH!
Would you mind explaining a little bit how you exactly knew what to do, so that I can do it should the problem appear again?
PS: For some reason, I cannot attach the zoek-results.log file to my post, as it says the uploaded file is empty. So I'll copy-paste its content below.
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Zoek.exe v5.0.0.1 Updated 30-09-2015
Tool run by Pablo on 03/10/2015 at 11:59:32,87.
Microsoft Windows 8.1 Enterprise 6.3.9600 x64
Running in: Normal Mode Internet Access Detected
Launched: D:\Escritorio\zoek.exe [Scan all users] [Script inserted]
==== System Restore Info ======================
03/10/2015 12:01:28 Zoek.exe System Restore Point Created Successfully.
==== Empty Folders Check ======================
C:\PROGRA~3\Oracle deleted successfully
C:\Users\Pablo\AppData\Local\EmieBrowserModeList deleted successfully
C:\Users\Pablo\AppData\Local\EmieSiteList deleted successfully
C:\Users\Pablo\AppData\Local\EmieUserList deleted successfully
C:\Users\Pablo\AppData\Local\GHISLER deleted successfully
C:\Users\Pablo\AppData\Local\MediaShow deleted successfully
C:\Windows\serviceprofiles\networkservice\AppData\Local\PeerDistPub deleted successfully
C:\Windows\serviceprofiles\networkservice\AppData\Local\PeerDistRepub deleted successfully
==== Deleting CLSID Registry Keys ======================
==== Deleting CLSID Registry Values ======================
==== Deleting Services ======================
==== Batch Command(s) Run By Tool======================
Configuraci¢n IP de Windows
Se vaci¢ correctamente la cach‚ de resoluci¢n de DNS.
==== Deleting Files \ Folders ======================
C:\PROGRA~2\FreeRIP deleted
C:\PROGRA~3\APN deleted
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Search.lnk deleted
C:\Users\Pablo\AppData\Local\DNIeService.exe deleted
==== Firefox Extensions ======================
==== Firefox Plugins ======================
==== Chromium Look ======================
HKEY_CURRENT_USER\SOFTWARE\Google\Chrome\Extensions
lmjegmlicamnimmfhcmpkclmigmmcbeh - No path found[]
New Tab Website - Pablo\AppData\Local\Google\Chrome\User Data\Default\Extensions\dgkogmmlmfijkljjnhalncbabkljhceo
Chrome Hotword Shared Module - Pablo\AppData\Local\Google\Chrome\User Data\Default\Extensions\lccekmodgklaepjeofjdjpbminllajkg
Google Drive App Launcher - Pablo\AppData\Local\Google\Chrome\User Data\Default\Extensions\lmjegmlicamnimmfhcmpkclmigmmcbeh
==== Chromium Startpages ======================
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Preferences
"homepage": "
Yahoo Search - Búsqueda en la Web",
==== Chromium Fix ======================
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Local Storage\https_c.betrad.com_0.localstorage deleted successfully
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Local Storage\https_c.betrad.com_0.localstorage-journal deleted successfully
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Extensions\dgkogmmlmfijkljjnhalncbabkljhceo deleted successfully
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Local Storage\chrome-extension_dgkogmmlmfijkljjnhalncbabkljhceo_0.localstorage deleted successfully
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Local Storage\chrome-extension_dgkogmmlmfijkljjnhalncbabkljhceo_0.localstorage-journal deleted successfully
==== Set IE to Default ======================
Old Values:
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Start Page"="
Yahoo Search - Búsqueda en la Web"
New Values:
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Start Page"="
Google"
==== All HKCU SearchScopes ======================
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\SearchScopes
"DefaultScope"="{B8652394-FA48-4365-AE56-E3D8F9B049A5}"
{012E1000-F331-11DB-8314-0800200C9A66} Google Url="
{searchTerms} - Google Search"
{0633EE93-D776-472f-A0FF-E1416B8B2E3A} Unknown Url="Not_Found"
{B8652394-FA48-4365-AE56-E3D8F9B049A5} Google Url="
{searchTerms} - Google Search"
==== Deleting CLSID Registry Keys ======================
HKEY_USERS\S-1-5-21-669124520-515078460-1658524391-1001\Software\Microsoft\Internet Explorer\SearchScopes\{0633EE93-D776-472f-A0FF-E1416B8B2E3A} deleted successfully
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\SearchScopes\{0633EE93-D776-472f-A0FF-E1416B8B2E3A} deleted successfully
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\SearchScopes\{0633EE93-D776-472f-A0FF-E1416B8B2E3A} deleted successfully
==== Deleting CLSID Registry Values ======================
==== Empty IE Cache ======================
C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5 emptied successfully
C:\Users\Pablo\AppData\Local\Microsoft\Windows\INetCache\Content.IE5 emptied successfully
C:\Users\Pablo\AppData\Local\Microsoft\Windows\INetCache\Low\Content.IE5 emptied successfully
C:\Windows\SysNative\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5 emptied successfully
C:\Windows\sysWoW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5 emptied successfully
C:\Windows\sysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5 emptied successfully
C:\Users\Pablo\AppData\Local\Microsoft\Windows\INetCache\IE emptied successfully
C:\Users\Pablo\AppData\Local\Microsoft\Windows\INetCache\Low\IE emptied successfully
C:\Windows\SysNative\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE emptied successfully
C:\Windows\sysWoW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE emptied successfully
==== Empty FireFox Cache ======================
No FireFox Profiles found
==== Empty Chrome Cache ======================
C:\Users\Pablo\AppData\Local\Google\Chrome\User Data\Default\Cache emptied successfully
==== Empty All Flash Cache ======================
Flash Cache Emptied Successfully
==== Empty All Java Cache ======================
Java Cache cleared successfully
==== C:\zoek_backup content ======================
C:\zoek_backup (files=44 folders=6 6580343 bytes)
==== Empty Temp Folders ======================
C:\Users\Default\AppData\Local\Temp emptied successfully
C:\Users\Default User\AppData\Local\Temp emptied successfully
C:\Users\Pablo\AppData\Local\Temp emptied successfully
C:\Windows\serviceprofiles\networkservice\AppData\Local\Temp emptied successfully
C:\Windows\serviceprofiles\Localservice\AppData\Local\Temp emptied successfully
C:\Windows\Temp will be emptied at reboot
==== After Reboot ======================
==== Empty Temp Folders ======================
C:\Windows\Temp successfully emptied
==== Empty Recycle Bin ======================
C:\$RECYCLE.BIN successfully emptied
==== EOF on 03/10/2015 at 12:25:53,64 ======================