请问分区表出问题了怎么恢复？

meditator

机器为IBM TP R51，最初有两个分区(预装WinXP的NTFS区和IBM的系统恢复分区)，然后在Windows下使用PQMagic分出一段空白分区，在其上安装了FreeBSD 4.10，后来再启动PQMagic的时候提示有××××(忘记内容了)错误，当时看也没看就点了确定，N多天以后发现PQMagic使用不了了，在FreeBSD 下执行fdisk时也会出现下面的错误提示，说分区表不在第1柱面，试图使用IBM的Access IBM键恢复系统，结果弹出蓝屏说什么Session Manager初始化错误，不敢乱改分区表，所以请教各位大虾，帮忙看一下是什么缘故怎样恢复，多谢！！

fdisk错误提示如下：

MyFB# fdisk
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=4864 heads=255 sectors/track=63 (16065 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=4864 heads=255 sectors/track=63 (16065 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 7,(OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX)
    start 63, size 56669697 (27670 Meg), flag 0
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 675/ head 134/ sector 63
The data for partition 2 is:
sysid 18,(Compaq diagnostics)
    start 68508720, size 9631440 (4702 Meg), flag 0
        beg: cyl 1023/ head 255/ sector 63;
        end: cyl 1023/ head 254/ sector 63
The data for partition 3 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
    start 56669760, size 11831400 (5777 Meg), flag 80 (active)
        beg: cyl 1023/ head 255/ sector 63;
        end: cyl 1023/ head 254/ sector 63
The data for partition 4 is:
<UNUSED>;
MyFB#

IBM系统恢复时的错误：

Stop c000021a { Fetal System Error }
The Session Manager Initialization system process terminated unexpectedly with a status of 0xc000003a ( 0x00000000 0x00000000 )
The system has been shut down