What level of IE?  How are you "trying to access" your ftp site?
<title>KB217888 - How to Install and Use FTP Folders</title>
<quote>
FTP Folders is included with the Internet Explorer Browsing Enhancements feature in Internet Explorer 5.x, which is installed
only when you select a full or typical installation.
</quote>
Do you know what kind of install you have?
Perhaps if it is Minimal you wouldn't have it?
Check to see if you have  msieftp.dll  and if so what are its properties.
See this article for further information along that line.
<title>KB299893 - Unable to Install FTP Folders When You Install Internet Explorer 6</title>
(MSKB Boolean search for
"FTP folders"   AND  kbieWinMEsearch
)
BTW the method that you are using to specify your password is not
recommended.   Once you open the  ftp  site  *without*  a password
do you have a  Login As...  menu item in the  File  menu?
<title>KB135975 - How to Enter FTP Site Password in Internet Explorer</title>
HTH
Robert