I've been trying to get BOINC to run on my PC for the past 5 hours so after many searches and trials and errors, I decided to post the exact situation hoping that someone has an idea on how to fix this problem.

I have an AMD Athlon64 CPU and I just installed Fedora 7 (the 64-bit version) on it. I downloaded BOINC 5.9.11 (the Linux/x64 version). I copied the file into a folder called BOINC in my home directory (e.g. /home/xyz/BOINC, where xyz is the username). Then I opened a terminal and changed my directory to the one which contains the BOINC file I downloaded and ran this command:

sh /home/xyz/BOINC/boinc_5.9.11_x86_64-pc-linux-gnu.sh

The file extracted without any problems but nothing is working after this. I tried running the boincmgr but it gives a "Segmentation fault". And when I tried to run the client I got "[error] GUI RPC bind failed: 98". I have no idea what the problem could be. I followed the instructions listed on the site, I tried moving the folder to other directories but it didn't help. I tried to run the binaries as root but that didn't help either.

I simply want to get BOINC running, attach it to some projects and get it to automatically start in the background each time I log into my account. Any ideas how to fix this problem?

I was wondering if installing a 32-bit version of BOINC on the x64 system would work and if there are any needed files or libraries that I have to download.

I haven't used FC myself but there is a segmentation fault problem with the 64bit BOINC on Linux. Solution is replace boincmgr with one from an older version of BOINC say a 32bit 5.8.x version.
As for the other problem its new to me but i generally use Kubuntu and it works there if you use an old 32 bit boincmgr.