Problem installing shoes2 on Vista

First…do not mock my ownership of a Vista laptop…I have various
excuses at the ready, haha.

Anyway, onto the real problem, I just downloaded the installation file
for shoes, from the shoes website, when I run the setup I tell it to
install in G:\Shoes which has plenty of free space, as soon as I click
install I get:

Error opening file for writing:

with the options to abort, retry or ignore. When I click ignore it
brings up the same error message but for iconv.dll, and then another dll
if I click ignore again, etc.

Any ideas as to what I am doing wrong?