Keeps cycling back to Login Screen

Keeps cycling back to Login Screen

Windows XP Pro I installed Ubuntu using the Windows Installer but it does
not work properly. Initially I got the Login screen and entered the
password. It started to load the desktop but never did completely load....
no icons etc. It then returned to the Login screen. I re-entered the
password.... black screen for awhile... then the default color screen
without anything else. After quite awhile, it returns to the Login screen.
Re-entered the password... black screen.... return to Login.
Completely un-useable .... Wanted to try Ubuntu but I am not a computer
geek so I suppose it is a lost cause.....