关于分区合并的问题

电脑上装的是xp/linux双系统，在xp中使用partitionmagic删除linux下的所有分区，并将之转换为fat32格式，在将所转换的分区进行合并时出现以下错误：
Error 510: "The version of the file system is not supported"

google许久，终得一答案：
Error 510: "The version of the file system is not supported" when attempting to modify Linux Ext3 partitions

Situation:
You are trying to modify a Linux Ext3 partition using PartitionMagic 8.0. You see the message "Error 510: The version of the file system is not supported."

Solution:
Norton PartitionMagic 8.0 and PartitionMagic 8.0 may not work with Linux Ext3 partitions when the dir_index file system attribute is enabled. Recent Linux releases from Red Hat and Fedora set the dir_index file system attribute by default. To prevent the error, disable the dir_index attribute, perform the partition modification, then re-enable the attribute.

To disable the dir_index attribute

1. Boot into Linux single-user mode.
2. Type the following:

umount /dev/xxx


where xxx is the device name of the file system to convert.
3. Press Enter.
4. Type the following:

tune2fs -O^dir_index /dev/xxx

5. Press Enter.
The dir_index file system attribute is removed.
6. Restart the computer into Windows.
然而问题再次出现，我已经删除系统不肯能再进入linux中了，怎么解决这一问题？或者还有什么更好的办法？