PE2650 install RAID 5 on existing server

Hello,

  I have a PE 2650 with 2 scsi 73 gb hd's (not in any RAID config).  I purchased a Dell perc 4/dc and would like to get it setup with raid 5.  Is there a way I can do this without having to reload the o/s (win 2000) and restoring the original from backup back onto the new RAID 5?  If there isn't is there a white paper describing the steps to do this?

Also, I have been told that the PE2650 has an onboard raid controller card.  How can I enable this?  If I do enable this, will it disable the 2 external scsi ports that I currently use to connect a powervault 112t (dual vs80 tape drives)?

Thanks!