Error HTTP 404.3 - Not Found

what url are you trying to access?

is this for classic asp or asp .net? they're two different technologies so it's important to know which one you're using

also, make sure you have the asp .net framework installed (i'm starting to think this is just for asp.net)

This is because IIS will only serve out files that are defined MIME types - so you will need to add *.asmx manually.

The url i try to acces is: http://localhost/SWS/SWS.asmx 
And yes it's asp.net and i already installed the framework

1. Go to IIS Manager, on the left hand side menu, click on Application Pools.
2. In the main window, right click on “DefaultAppPool” or “Classic .NET AppPool” depending on which one you use for your website.
3. Select “Advanced Settings”, in the “General” section in the pop-up window, check “Enable 32-Bit Applications” to “True”,

how to add *.asmx manually??

Now i get an Error HTTP 401.3 - Unauthorized

have a look here to add MIME types:

https://technet.microsoft.com/en-us/library/cc725608%28v=ws.10%29.aspx

make sure IUSR and NETWROK SERVICES have permissions on your site folder

IUSR have it but how to know about NETWORK SERVICES?

its a user found in the local machines user list (same place as the IUSR account)

what AppPool are you running the site under> Do you have any certificates (SSL) related to the site?

Good now i fixed the authorisation problem and MIME type problem and now i have this page:
localhost-SWS-SWS.pdf

in IIS, go to the ASP.NET tab and make sure a version for the framework is selected

where is it IIS?

follow these instructions

https://technet.microsoft.com/en-us/library/cc754523%28v=ws.10%29.aspx

The framework .NET is selected. It's: .NET Framework v2.0.50727

i wonder if the IUSR and NETWORK SERVICES accounts have to have access to where the DLL resides. Other than that, I'm not sure what else to do.

Is there anything noteworthy is the Event log on the server?

I don't understand anything in that i just followed the installation tuto.
If you want, here is my SWS.asmx file, may be he is wrong:

sorry here the file (i can't uploade a file .asmx):

<%@ WebService Class=SprintometerWS.SprintometerWSClass %>