Partition Format

Hi, can any one help me to re-format my Mac Book Pro note book? I partitioned 1/3 of my HDD and installed VMware Fusion to run Windows XP. Now, my Windows XP has problems and I have to re-format the partitioned HDD where Windows XP is installed. I don't want to reformat the whole HDD only the partitioned section and re-install Windows XP. Any ideas?...Thanks