Hm... Well, what about this..?
Code:
sudo grub-install --recheck /dev/sda
sudo update-grub
This should re-run the detection process and hopefully detect your Windows partition...
Additionally, could you go to a terminal and post the output of the above commands and "df" here if that doesn't work?
Didn't detect my windows; Heres my output
harvey@harvey-Aspire-V3-571G:~$ sudo grub-install --recheck /dev/sda
Installation finished. No error reported.
harvey@harvey-Aspire-V3-571G:~$ sudo update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.5.0-17-generic
Found initrd image: /boot/initrd.img-3.5.0-17-generic
Found memtest86+ image: /boot/memtest86+.bin
and for "df"
harvey@harvey-Aspire-V3-571G:~$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 7689384 5031412 2267368 69% /
udev 2955724 12 2955712 1% /dev
tmpfs 1185972 940 1185032 1% /run
none 5120 0 5120 0% /run/lock
none 2964924 224 2964700 1% /run/shm
none 102400 36 102364 1% /run/user
/dev/sr0 226938 226938 0 100% /media/harvey/Recovery
/dev/sdb1 390708800 288671832 102036968 74% /media/harvey/100C8B2A0C8B09C4