ok well this is a little complicated to explain so m gonna summarize it as much as possible.

i have a HP Sleekbook 15-B002xx which came with a windows 8 OS installed already. due to some reasons, i tried to shift it back to windows 7. After many unsuccessful tries, i finally managed to install windows 7 by changing my boot sequence to Legacy Boot.
later on, due to lack of drivers for win 7, i installed, rather upgraded to win 8 which was running on legacy boot (using MBR if im not wrong). now, i want to install a fresh copy of win 8 with UEFI but the problem is when i change my boot sequence to disable legacy boot, then during installation of win 8, i cannot see my HDD :(... im using a flash drive to install win 8 which is already in UEFI (i used diskpart for that).
also, when i use legacy boot and try to install windows, then the HDD appears and when i format the HDD and create new partitions, it creates 3 partitions (System, MSR, Reserved) and the fourth one for OS. i tried installing the windows like this but after install, when i change the boot sequence to UEFI again, it fails to boot :(

now, i want to install windows to UEFI... and i really need help with this please :(... i hope i have explained the scenario... if anyone would like to ask anything, please do :(... as i really need to get this away... and also, i'd like to ask that how can i check if my HDD has been changed from MBR to GTP?

im not that much expert with this stuff so i hope i have used the terminologies right... awaiting answer people :(..

Thanx in advance

You can't see the HDD, because your HDD is MBR style when you installed Win7 in legacy mode. But when using UEFI you must use a GPT style disk.

At the beginning of the setup press SHIFT+F10 to open the command prompt. Run DISKPART, select the DISK and delete all partitions on it. Exit DISKPART, close the CMD and continue the Setup. Now you should see it.

Dear Sir,
Even i faced the same problem ad finally by the grace of God got it solved Here is how i did it

Boot the Laptop in UEFI Mode

1) Download intel storage technology driver 11.7 or higher

2)copy this extracted zip file to a Fat32 formatted usb

3)now install windows
When it reaches the dialog box where it asks the users to select the drive in which the os needs to be installed
you will see a load driver option beneath that
browse to the folder where the driver that you have downloaded is present and press next

After the execution of the following step you should be able to see the drives present and now you can proceed with the normal installation.

Hope i have solved you problem.
Regards,
Melvin

• Proposed as answer by S__C 21 hours 31 minutes ago

Dear Sir,
Even i faced the same problem ad finally by the grace of God got it solved Here is how i did it

Boot the Laptop in UEFI Mode

1) Download intel storage technology driver 11.7 or higher

2)copy this extracted zip file to a Fat32 formatted usb

3)now install windows
When it reaches the dialog box where it asks the users to select the drive in which the os needs to be installed
you will see a load driver option beneath that
browse to the folder where the driver that you have downloaded is present and press next

After the execution of the following step you should be able to see the drives present and now you can proceed with the normal installation.

Hope i have solved you problem.
Regards,
Melvin

• Proposed as answer by S__C Wednesday, March 04, 2015 6:00 PM

Thank you, Melvin George!!!

• Edited by Dncarbonell Friday, July 26, 2013 7:52 PM name

This is not entirely accurate. In some instances I have found that

DISKPART / LIST DISK /  SELECT DISK 0 / SELECT PARTITION n / DELETE PARTITION OVERRIDE

does not always reset some of SSD, and DISKPART may net be rewritten for the SSD for another decade.

The safest method is not to delete partitions but to clean the partition anchor layer:

DISKPART / LIST DISK / SELECT DISK 0 / CLEAN ALL.

To reconfigure Win7 MBR for Win8, finish up with CLEAN ALL / CONVERT GPT

Melvin George's solution worked for me. Thanks.