To Run sfc.exe Windows 10 (To Check System Files)

Right Mouse Click the Window Icon bottom Left
Left Click Command Prompt (admin) to run as an administrator
Type sfc /scannow
Takes some time with percentage showing.

Disk Will Not Initialize- Data Error (cyclic redundancy check)

Seagate Pipeline HD (1TB) Hard Drive (5900rpm) 6Gb/s SATA 64MB  Video Drive on Humax YouView PVR.

Humax Youview on Start Up reported.   Please Wait.....(forever)
Factory Reset procedure all 5 options did not respond. Disk Removed.
Fitted into an external USB3 Docking Bay
Windows Control Panel Disk Management reported as Disk needs to be initialized
then Data Error (cyclic redundancy check).

The only software that would access the drive and give a diagnosis was Mini Tools Partition Wizard.
This reported it as a bad disk and partition recovery did not recover it.

Deleted Files still show in Windows 7 Explorer...a Fix

If you delete a file with the delete key on the keyboard and they still show in the folder in Windows Explorer. When you press delete again it says file not found.
Try arranging the file names alphabetically.
This works sometimes

or

One of the most successful solutions to this problems (although it doesn't help all the time) is to turn on the Windows desktop refresh feature. To do this, go to the Registry
"HKEY_CLASSES_ROOT\CLSID\{BDEADE7F-C265-11D0-BCED-00A0C90AB50F}\Instance", look out for a DWORD value called "DontRefresh" which is set to "1" (on). Change the value to "0" (off). This re-enables the refresh. Note that the CLSID given above may depend on your machine. The easiest solution if you can't find the key is to just go to "HKEY_CLASSES_ROOT\CLSID", hit "F3" and do a search for "DontRefresh

Network Adaptor (Ehernet Connector on PC) check speed

To check speed of Network Adaptor

RUN
CMD
Type  wmic NIC where NetEnabled=true get Name, Speed

Returns as below  which is a Gigabit Connector (1000000000)

Microsoft Windows [Version 10.0.10586]
(c) 2015 Microsoft Corporation. All rights reserved.
C:\Users\xxxx>wmic NIC where NetEnabled=true get Name, Speed
Name                                         Speed
Intel(R) 82566DC Gigabit Network Connection  1000000000

C:\Users\xxxxl>

Test Memory Modules (RAM Chips) in Windows

Windows has a built in Memory Diagnostics  Tool
Type RUN
Type mdsched

Computer will reboot and run in DOS two passes and then reboot into Windows and produce a report.

Also a Free utility memtest 86 does a more comprehensive test but needs a bootable CD creating.