dissapearing kernel-headers

[Richard B. Pyne]

I know this has been covered before, but I can't find it in 
either my notes or in the list archives, but what is the process 
for re-creating the kernel-headers?

I have one machine where the /usr/include/linux and 
/usr/include/asm directories keep dissapearing and I have to 
keep restoring them from a backup.

I tired ( after restoring the headers) doing a lin linux ; lin 
glibc and lin gcc (after restoring the missing headers again).

I have tried lin kernel-headers several times along the way and 
get:

Building kernel-headers
bzip2: (stdin) is not a bzip2 file.
tar: Child returned status 2
tar: Error exit delayed from previous errors

Thanks for your help.

--Richard