[CentOS] convert from fedora with reiserfs to centos-4.3

I upgraded a box running fedora core 2 to Centos-4.3
The fedora core box has a reiserfs file system, which I am assuming is not 
supported in the CentOS kernel. I tried the unsupported kernel but I still 
get a kernel panic.

Can I either convert to ext3, or possibly install something that will make 
my reiserfs filesystem work ?

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