[CentOS] (5.6) Kernel Link Error

Installing VirtualBox-4.1* on Centos 5.6 X64, I get at the end:-

Error! Your kernel headers for kernel 2.6.18-274.el5 cannot be found at /lib/modules/2.6.18-274.el5/build or /lib/modules/2.6.18-274.el5/source.

In /lib/modules/2.6.18-274.el5/ I find two broken links:-

build -> /usr/src/kernels/2.6.18-274.el5-x86_64

source -> ditto

The reason why they are broken appears to be the current address is actually

/usr/src/kernels/2.6.18-274.3.1.el5-x86_64

Show I reset the links in /lib/modules/2.6.18-274.el5 to point to /usr/src/kernels/2.6.18-274.3.1.el5-x86_64 or is their a bigger problem that needs attention ?