UBCD actually does not let you login to Windows as far as I know, or at least it's not designed for it.
If you want a LiveCD Windows environment to access your computer, you'd better look for UBCD4Win ^^
I was going to suggest that but you have to keep in mind most people do NOT have a windows cd as their machine was oem. I only suggest it later. But thanks for posting that info.
Visit the UBCD Wiki: http://wiki.ultimatebootcd.com
Please check your UBCD
ISO MD5 Hash Sum
; May prevent issues later on by not having an exact copy.
Currently Working on Common Issues and Repair Tips
on the Wiki.