找到VSS的数据库目录，找到data文件夹，里面有个um.dat文件，用十六进制编辑器工具打开（如UltraEdit），找到00000080h，00000090h，000000a0h这三行，分别改成下面对应的值，这就是把管理员admin的密码改为空：
00000080h：55 55 bc 7f 41 64 6d 69 6e 00 00 00 00 00 00 00
00000090h：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000a0h：00 00 00 00 90 6e 00 00 a8 01 00 00 00 00 00 00
00000080h：55 55 bc 7f 41 64 6d 69 6e 00 00 00 00 00 00 00
00000090h：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000a0h：00 00 00 00 90 6e 00 00 a8 01 00 00 00 00 00 00