PR and recompiling

[Michele]

Hi there,
I have some problems (ATA_IDENTIFY timeout) when I try to install 
FreeBSD 5.3-RELEASE (CD).
With Google, I have found the PR of my problem, posted by another user:

http://www.freebsd.org/cgi/query-pr.cgi?pr=74124

It says to comment some lines in /usr/src and then to recompile all. How 
can I recompile the kernel if I can't install FreeBSD ?!

Thanks in advance,

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