Well, if there is nothing you want to keep on either partition, then I would do a clean install of Linux.
Most good installations programs will give you options for setting up/changing the partitioning scheme used (Did that in my Centos 4.1 & Solaris 10 installs ) ... This will wipe out the partitions and create a new partition to your standards.
just my $.02 on the matter,
darryl dB_the_DBA
