If you're getting to 99% it looks everything is ok and it just tells you the symbolic links to files are wrong (as it's on XP I would say this is expected). Now look at the extracted files for qemu-i386 (it should be around 3mb, or somewhere near that size). Put my archive in /media/mmc1/ (if you copied it over to MyDocs open up terminal and
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cd /home/user/MyDocs
cp RLsN900.tar.gz /media/mmc1/
cd /media/mmc1
tar -xzvf RLsN900.tar.gz
(I am assuming above that N800 folder structure is the same as N900)
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This should get you 'rls' folder with subfolders with games and 'inc' subfolder with libraries. In /media/mmc1/rls/ there is 'qemu-i386' which runs on N900. Overwrite this file with the one you extracted from 'linux-user-test-0.3.tar' and make it executable (assuming you copied it to MyDocs in terminal):

cd /home/user/MyDocs
cp qemu-i386 /media/mmc1/qemu-i386
cd /media/mmc1
chmod 777 qemu-i386

And you should be ready to go (if your card is formatted to ext2/3 so the chmod works). If for some reason your card is not in /media/mmc1 and the rls folder ends up there you will need to amend run.sh for each game (just change the line '/media/mmc1/rls/qemu-i386 /media/mmc1/rls/inc/ld-linux.so.2 --library-path /media/mmc1/rls/inc ./<game_binary>' so that /media/mmc1/ is the correct path for your memory card. It's just below '# Run ADOM in emu' line - yeah I'm that lazy typing on small keyboard, didn't bother to remove it). Hope this works. If not, try with the other N800 build from that thread.

Good luck!