I have never had a problem downloading, installing and using the package on this page,
https://www.virtualbox.org/wiki/Linux_Downloads
and labeled,
Quote:
All distributions (built on EL5 and therefore do not require recent system libraries) i386 | AMD64
|
Click on either i386 or AMD64, depending on your processor.
Once downloaded, run, as root, sh ./whateverversionyoujustdownloaded.run
Be sure to also install the correct extension pack.