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i have following problem with my HDD in my laptop, i have win 7

my partitions are gone hide and not visible in my computer, when i try to look them in disk management the partitions which are hidden have no drive letter assigned, when i try to assign the drive letter or even try to format a drive this error messages every time and restating my laptop didn't make any difference. i am going to attach the screen shot of errorenter image description here

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I think the problem is because you have assigned some other Letter for your Operating system Disk.

Run Partition master as Admin and configure your Disks.

Or else

You should format the Entire PC .

If you are formatting,then do create a backup.

You may also delete the partition and check if that is working:

See here for more details :

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