wubi installer won't work on Vista Home Basic

When I try to run Wubi on vista home basic I get a "no disk in drive" error message. If I click on try again several times, then click on cancel, the installer appears. When I finally get it to run, it tries to install Ubuntu for a 64 bit AMD system. I have an Intel Pentium Dual CPU, T3200 @ 2 gig, 3 gigs ram, 32 bit system. I have tried this at least twice and, to date, have been unable to install the correct version of Wubi. I am afraid to install the version for the AMD chip, for fear it will not be compatible and cause trouble. I would appreciate any help that might enable me to use Wubi on Vista Home Basic to install the Ubuntu version appropriate for this system.. I had it on an older machine that the power company murdered and I liked it. Thanks for the help.