Just reinstall. At the beginning of the install process, you'll have the option of blowing away all existing partitions.
Assuming there is no data on there you wish to keep.
What 'bug' is it and why can't you remove it or repair?
In your case - you don't un-install it, you re-install it over. Make a backup of your data, boot from installation DVD, and choose to format the drive during re-installation.