However, a few days ago when I was setting up my server again after a hard drive failure, I came across a problem running the Folding at Home x64 SMP client. The error message I got was bad ELF interpreter... which confused me because I don't know how you can possibly interpret a compiled binary. I did a bit of searching, and it turns out that I didn't have some of the required libs, at least not in the format it had to be in.
The culprit was glibc, pretty standard libs, but in it's x86 form, as the x64 files were properly installed. What's weirder is that the Linux SMP client, which is x64 only, needs x86 files to run... hmmm hmm. Anyways, the problem can easily be solved be running the following line at your terminal.
yum install glibc.i686
SMP should now run smooth. Happy folding!