absolute URL error

hi,

I tried installing it on my host, but it won't take my absolute URL.

I have installed it at http://www.myhost.com/frontacct

and i ran the wizard from http://www.myhost.com/frontacct

and for absolute URL i put in http://www.myhost.com/frontacct

but it keeps on saying that my URL is wrong. Any ideas?
Thanks.