新人求助：win7下装ubuntu12.04双系统后无法进入win7

[roykingz]

如题，ubuntu安装成功，完美运行，启动列表中有ubuntu和win7的启动选项。ubuntu可以启动，win7启动之后进入一个新的空白界面，光标在左上角闪烁几下之后又返回到启动列表界面，试了n次都不行，本人第一次尝试安装ubuntu双系统，希望大神帮忙解决下！
sudo fdisk -lu运行后结果：
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4ca24c2c

Device Boot Start End Blocks Id System
/dev/sda1 * 63 83891429 41945683+ 7 HPFS/NTFS/exFAT
/dev/sda2 83891491 625137344 270622927 f W95 Ext'd (LBA)
/dev/sda5 83891493 201354689 58731598+ 7 HPFS/NTFS/exFAT
/dev/sda6 264269313 444647069 90188878+ 7 HPFS/NTFS/exFAT
/dev/sda7 444647133 625137344 90245106 7 HPFS/NTFS/exFAT
/dev/sda8 201355264 241354751 19999744 83 Linux
/dev/sda9 241356800 245354495 1998848 82 Linux swap / Solaris
/dev/sda10 245356544 264267775 9455616 83 Linux

Partition table entries are not in disk order

/etc/default/grub内容
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

/boot/grub/grub.cfg内容
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}

function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=auto
load_video
insmod gfxterm
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
set locale_dir=($root)/boot/grub/locale
set lang=zh_CN
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
clear
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/06_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sda1)" --class windows --class os {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root 96240C25240C0B47
chainloader +1
}
### END /etc/grub.d/06_os-prober ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
set gfxpayload="$1"
if [ "$1" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
}
if [ ${recordfail} != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu，Linux 3.2.0-55-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
linux /boot/vmlinuz-3.2.0-55-generic-pae root=UUID=23596b4b-f1a6-4c84-9778-a1a9f19d356d ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.2.0-55-generic-pae
}
menuentry 'Ubuntu，Linux 3.2.0-55-generic-pae (恢复模式)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
echo '载入 Linux 3.2.0-55-generic-pae ...'
linux /boot/vmlinuz-3.2.0-55-generic-pae root=UUID=23596b4b-f1a6-4c84-9778-a1a9f19d356d ro recovery nomodeset
echo '载入初始化内存盘...'
initrd /boot/initrd.img-3.2.0-55-generic-pae
}
submenu "Previous Linux versions" {
menuentry 'Ubuntu，Linux 3.2.0-24-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
linux /boot/vmlinuz-3.2.0-24-generic-pae root=UUID=23596b4b-f1a6-4c84-9778-a1a9f19d356d ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.2.0-24-generic-pae
}
menuentry 'Ubuntu，Linux 3.2.0-24-generic-pae (恢复模式)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
echo '载入 Linux 3.2.0-24-generic-pae ...'
linux /boot/vmlinuz-3.2.0-24-generic-pae root=UUID=23596b4b-f1a6-4c84-9778-a1a9f19d356d ro recovery nomodeset
echo '载入初始化内存盘...'
initrd /boot/initrd.img-3.2.0-24-generic-pae
}
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set=root 23596b4b-f1a6-4c84-9778-a1a9f19d356d
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

[roykingz]

在网上搜了好多方法，试过了如下方法
sudo grub-install /dev/sda
sudo update-grub
sudo dd if=/dev/sda of=/dev/sda bs=512 count=1 seek=63 skip=83891429
第三行的几个变量我是按照自己的理解以及sudo fdisk -lu后显示的数据设置的，然后重启后还是进不去win7,但是出现了这个乱码：