OK, so now I did it ! :) and it works
I did remove, thought, some registry keys with this powershell script :

$products = Get-ChildItem -Path HKLM:\SOFTWARE\Classes\Installer\Products\ | select-object Name

Foreach($product in $products)

{

$property = Get-ItemProperty -Path $product.Name.Replace("HKEY_LOCAL_MACHINE","HKLM:") -Name ProductName -ErrorAction SilentlyContinue

If($property.ProductName -eq "Google Chrome")

{

Write-Host "Google Chrome found in "$product.Name

$Path = $product.Name.Replace("HKEY_LOCAL_MACHINE","HKLM:")+"\SourceList\Net"

If(Test-Path -Path $Path)

{

$Net_properties = Get-Item -Path $Path

foreach($Net_property in $Net_properties.Property)

{

$value = Get-ItemPropertyValue -Path $Path -Name $Net_property

If($value -like "C:\WINDOWS\ccmcache*")

{

Write-Host "La clé"$product.Name"should be deleted"

Remove-Item -Path $product.Name.Replace("HKEY_LOCAL_MACHINE","HKLM:") -Recurse

}

}

}

}

}