data recovery - I deleted disk partitions - installing Ubuntu 11.04 to WIN7 build - I need windows back but how?

Steps to disaster

1. Installed Ubuntu 11.04


2. Partitioned drive upon install and gave Ubuntu entire disk.

Several months later I need WIN7 as dual boot

What happens at present

Booting into WIN7 via F9 option at boot .. takes me to Ubuntu. It
describes 'preparing to boot from Windows' but screen goes purple and
it comes up with Ubuntu instead.

Booting normally : machine either makes a horrible beeping
(continious) and blank screen or boots in Ubuntu or a mix of beeping
initially then fires up Ubuntu. (to be honest best to F9 to get into
Ubuntu .. seems the cleaner option)

Using a script I have obtained the following disk information:

Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img.
core.img is at this location and looks for (,msdos1)/boot/grub on this drive.

Windows is installed in the MBR of /dev/sdb.sda1:

(obviously no partition exists on the drive - that's my understanding and my knowledge of unix/linux/ubuntu is limited)

nb.there is a ref to sda1 at the bottom of this script for grub (grub2 is installed) which is sda1/boot/grub/grub.cfg:

File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 11.04
Boot files: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

sda2:

File system: Extended Partition
Boot sector type: -
Boot sector info:

sda5:

File system: swap
Boot sector type: -
Boot sector info:

sdb1:

File system: vfat
Boot sector type: Windows XP: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /boot/bcd

Drive: sda

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sda1 * 2,048 310,503,423 310,501,376 83 Linux
/dev/sda2 310,505,470 312,580,095 2,074,626 5 Extended
/dev/sda5 310,505,472 312,580,095 2,074,624 82 Linux swap / Solaris

Drive: sdb

Disk /dev/sdb: 8004 MB, 8004304896 bytes
255 heads, 63 sectors/track, 973 cylinders, total 15633408 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sdb1 * 63 15,633,407 15,633,345 c W95 FAT32 (LBA)

"blkid" output:

Device UUID TYPE LABEL

/dev/sda1 94108733-fa78-47f3-b04d-31fb682e442e ext4
/dev/sda5 4c57bb9e-d799-4c06-a5ad-c1ddbcbb46d3 swap
/dev/sdb1 6B1C-F558 vfat

Mount points:

Device Mount_Point Type Options

/dev/sda1 / ext4 (rw,errors=remount-ro,commit=0)
/dev/sdb1 /media/6B1C-F558 vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush)

sda1/boot/grub/grub.cfg:

So how do I retrieve either (in order of preference)

1. Dual boot with Windows 7


2. Win7 complete reinstall.

N.B I have no data that requires saving and I have the Windows device drives and a Ubuntu 11.10 install package

Hurdles to overcome:

1. It's Acer One laptop with no DVD/CD drive


2. Installing WIN7 from a Flash Drive bombs out as it cannot recognise any system devices as the drivers are not installed/accessible.

My gut feeling is that I a) need to install Ubuntu fresh and
repartition the drive but I am unsure how much damage it will do .. or
b) partition the drive from within Ubuntu and stick windows files on
there and reallocate the pointer .. but not sure how to make it
visible on boot as C:\ ??