How to restore deleted files and data

It's recommended to make a full HDD backup before attempt, and use that image to make a try, so the original HDD and data won't demage.

Some useful tools with links:

MiniTool® Partition Wizard
Restore demaged or deleted partition, MBR with MiniTool® Partition Wizard Bootable CD

Recuva
https://www.piriform.com/recuva
Using Recuva

Testdisk and Photorec
http://www.cgsecurity.org/wiki/TestDisk_Download
Regain a lost drive using Test Disk - An Illustrated Guide

R-Linux
http://www.r-tt.com/free_linux_recovery/Download.shtml
R-Linux User's Manual

Clonezilla
http://clonezilla.org/
How to use Clonezilla live

GetDataBack (It's not full free, but one of the best.)
https://www.runtime.org/data-recovery-software.htm
Step by Step: Doing a Data Recovery with GetDataBack

USB port error - Windows 7 / 8

Sometimes one or more USB port seems to be wrong in Windows 7.
First take a try with a LiveCD, so you can determine whether the operating system is good or not.
If it good, worth to make a full power off. Unplug the PC from the power outlet for 20-30 seconds, then plug in.
If the error still remains, probably the mainboard injured.

Wiping a drive, erase data permanently

Boot from a Linux Live CD.
Open a terminal as root.

Run:
# cat /dev/zero > /dev/hda

(Suppose that HDD or partition is hda.)

If you are not sure about it, than:
# fdisk -l

But you can use these Windows based softwares also:

Hard Disk Wipe Tool

Disk Wipe