Windows 7 installation dvd driver missing

I am trying to install windows 7 on my hp pavilion dv6-2165tx laptop. I bought the laptop with windows 7 HP installed on it. Then I had to format the disk and install ubuntu. Now I want to install windows on it so I formatted the disk. But when I go to the fourth step of the installation I get "CD/DVD driver is missing plug a dvd/floppy/usb to install it" something like this. After giving a dvd driver I get message "device driver missing ".I tried a lot but I can't go any step further.
I tried to repair the computer in the second step but it shows an existing (X:) of size 30MB on it and it has "program files" and "windows" and "Users" and "System" folders in it. I think it is the part of the previous windows on it. I tried to remove it but it shows "access denied" for the folders and files. I tried to restore the windows but due to denied access to the files of X: , I can't do that too
any suggestions...

Pressing the f11 key during startup on a computer with an HP factory image will start the system recovery process even if the prompt is not displayed.Pressing the f11 key during startup on a computer with an HP factory image will start the system recovery process even if the prompt is not displayed.
As you install Linux, this may be mess up,
All Linux code must be deleted.As you have had linux on the HD you need do a Clean all & full format.
Type in command line
DISKPART
LIST DISK
SELECT DISK # (win HD)
CLEAN ALL
CREATE PARTITION PRIMARY
SELECT PARTITION 1
ACTIVE
FORMAT fs=NTFS
ASSIGN
EXIT
EXIT

SSD / HDD : Optimize for Windows Reinstallation


How to make HP Recovery DVD disks:
Recover Windows Vista Operating System Using HP Recovery - HP Customer Care (United States - English)

How to make HP Recovery USB disk:
Creating a Recovery Disk on a USB Flash Disk HP Pavilion dv6700z CTO Entertainment Notebook PC - HP Customer Care (United States - English)

or
You can Order HP Recovery Disks from here:
Compaq Mini CQ10-500 PC series - HP Notebook PCs - Order Recovery Discs for Windows 7, Vista, or XP - c00810334 - HP Business Support Center

I saw all those and tried for almost every thing still I can't get things fixed. In my the BIOS system of my laptop I can't see whether mode of SATA operation is set to AHCI or anything else, there is no such option to see for it.In the installation I provided the driver for machine/disk/cpu from the existing X: but none of these works.

I formatted the hard disk in the same way and apart from X: whole disk is formatted.besides that diskpart can't detect X: either in the hard disk or any other drive.

Formating will not DELETE the Linux code, CLEAN ALL will.

X is not remnants of the old OS, it is the DVD itself.

The error normally means you have bad installation media. Where did you get Win7?

If retail, clean the DVD with a soft cloth with outward motions. Or extract the ISO with ImgBUrn to write to flash stick using this tool with Win7 in the dropdown menu: Universal USB Installer – Easy as 1 2 3 | USB
Pen Drive Linux

If downloaded ISO, confirm it's integrity then burn another DVD using ImgBUrn at 4x speed with Verify, or write to flash stick.

You may need to wipe the HD (not format) as Ray says.

Reset the CMOS: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS

Finally the problem was fixed. The .iso file I had taken initially had one folder missing. I downloaded again, then got the problem fixed.
Now enjoying win7 Thank you all for the suggestions.

That's good news.
What folder was missing?