kernel headers not matching kernel version?

[Rory O'Connor <midget@elaris.com>]

I'm trying to install VMware on debian and all goes smoothly until it 
tries to find a 'vmmon' module for my kernel.  it's asking for the dir 
where my C header files are, but then saying that they don't match the 
version i'm running.  i don't see how that's possible.  here's the 
error:

The directory of kernel headers (version 2.2.19) does not match your 
running 
kernel (version 2.2.19pre17).  Even if the module were to compile 
successfully, it would not load into the running kernel.

seems like it might be a syntactical error somewhere.  any ideas?  any 
help appreciated!

thanks,

rory