New server + log on + forms... Please help...

[Kisrut]

Hello,
Please help me with my web site.

Have been using FP for 2 years and it worked well.
Every time I was logging into my server for the remote web site location I
was using:
http://www.mysite.com + username + password.

Last week I moved my web site to a new VPS with FP extension installed.
They gave me a temporary address to upload my files to and that I used for
logging into the server:
http://www.mysite-com.webhosting.com + username + password


I have uploaded all my files and everything worked well, my submitting forms
included.

I have updated DNS (more than72 hours ago).

Now all the problems start:

When I went to my full domain http://www.mysite.com/form.html the forms were
not working!
But they work 100% on http://www.mysite-com.webhosting.com/form.html

I have called hosting support # and they told me to change the log in data
for FP to:
http://mysite.com (Please note: no "www")
username
password
So I uploaded all files again.

Again the site works well on the full domain except forms that are not
working at all.
http://www.mysite.com/form.html (With "www" => forms are not working)
But if I go to:
http://mysite.com/form.html (Please note: no "www" => forms are working
100%!!)


First I have tried to change the log in with my full domain:
http://www.mysite.com (with "www") in hope that forms need exact address to
function.

But I can't log in...I'm getting message : Server does not have FP ext.
installed !!!

Now all my internal and external links are pointing to
http://www.mysite.com/form.html
so when visitors want to submit any data there the forms => no go :-( .

Please help, I am going insane .....
MS FP 2003