Hey there, Grandma! :-)
Windows... oh, boy...
...php.ini might need a little lovin' on this one. I will assume the following:
A) this server is under your complete control
B) you are familiar with php.ini, and
3) I hate IIS.
That said:
If memory serves me correctly, you can take a look in php.ini. There should be a section very similar to this:
[mail function]
; For Win32 only.
SMTP = localhost
smtp_port = 25
; For Win32 only.
;sendmail_from = me[at]example[dot]com
If you substitute your smtp server and e-mail information (the info your isp gave you for your e-mail account), I think php will probably send your mail. Don't forget to un-comment the lines listed above when done.
On the other hand, if this isn't relevant, and you are trying to use Windows SMTP services as well, then please ignore me completely. It's just been one of those days... (Did I mention I hate IIS)?
Good luck!!
Cj