Most likely your server is the latest Windows Server and does not use CDONTS. Try the folowing
<%
set MailObj = Server.CreateObject("CDO.Message")
MailObj.From = "serder@carstd.com"
MailObj.To = "receiver@yahoo.com"
MailObj.Subject = "Thanks for Registering with Carstudio!"
''// For text email use
MailObj.TextBody = "You have Registered for CarStudio.com"
''// For HTML email use
MailObj.HTMLBody = "You have Registered for CarStudio.com"
MailObj.Send
set MailObj = Nothing
Response.Write ( " Dealer Sucessfully Registered. Kindly wait for our notification email to approve your dealership.")
%>
As you can see it is very close, but leave it to MicroStiff to change it just enough to cause errors.