Use the command line package management tools to reinstall Xfce, either from the internet if you're connected or from a cd (the installation disc you used should contain the packages). I'm not sure which "Linux Lite" you mean (Linpus maybe?) so I can't give precise instructions---for those you should tell what it exactly is---but I'd guess it uses either rpm or apt to handle the packages (if you see .rpm packages in the installation cd or have 'yum' command available, it uses rpm or if you see '.deb' packages on the cd or have 'apt-get' command available, it uses apt). Could be something else of course, but those two are the generally used ones..
In case of rpm, try these. If you have an internet connection, try
or if you have the CD mounted, navigate (use 'cd' command to change directory and 'ls' to list directories) to the directory where Xfce packages are, and use
Code:
rpm -U xfce-someversion.rpm
to install the packages---of course use the real package filename instead of xfce-someversion.rpm for each of the Xfce packages.
If it uses apt instead, the equivalents would be as follows: if you had internet connection,
Code:
apt-get install xfce
or if not, navigate to the directory on the cd where the packages are and
Code:
dpkg -i xfce-someversion.deb
The above commands need to be run as root, so either use 'sudo' in front of the commands (if the system has 'sudo' configured) or then run
and give root password, then run the commands ('su' makes you become root, 'sudo' runs commands with root privileges). And of course you can obtain the packages for Xfce in another media than CD as well, just make sure they are in the right format (distribution-specific rpm or deb for example) for your operating system so you don't need to do gimmicks to install them. And if you use rpm/dpkg to install the packages "manually", remember that you need to install all the required packages (for Xfce there are a few, probably for core, panel, thunar etc.) and probably in the right order (you'll get notified if you try to do it in a "wrong" order of the dependencies, so don't worry). If you use yum/apt-get instead, just install the metapackage (I assume it's "xfce" but it could be something else in your distribution's reposities) and it should pull in the rest that you need.