HOw do I import files from Libreoffice in Xp into Windows 7?

I changed computers and have files in the old one that need to go into the new one. The old one cannot be accessed

I ... have files in the old one ... The old one cannot be accessed : ?? Do you have ANY access to your old files?

Yes, through a remote extension drive where the files from the old computer are stored.

What files do you want to import?

“Content files” (so e.g. Calc sheets) or configuration files?

The first has to be transfered to the new computer e.g. using a USB stick or as @isa4u using any cloud solution.
The configuration files do mostly work the same way, but they are a bit “hidden” (and depend on your operating system). Ask here again if you meant the config files.