Harry - if you are going to do a clean install of
Windows 7, take your time and make sure you have all your hardware drivers installed and that windows is all patched up with Windows updates.
Important If you are reinstalling your OS from scratch, make sure you have the utility / driver disk supplied by your PC manufacturer - but specifically the chipset drivers which normally get installed first, as sometimes Windows can't identify the hardware without this preventing driver installation. In other words, before you attempt Diagbox installation, you shouldn't have any yellow exclamation marks shown against any hardware devices in the Device manager
Get your PDF software installed too and maybe Apache Open Office which is free:
https://www.openoffice.org/
Z-Zip for opening compressed files:
http://www.7-zip.org/
Once you have all your basic software on and you are happy all is working, make a system restore point:-
To create a restore point in Windows 7:
- Open System by clicking the Start button Picture of the Start button, right-clicking Computer, and then clicking Properties.
In the left pane, click System protection. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
Click the System Protection tab, and then click Create.
In the System Protection dialog box, type a description, and then click Create.
If anything after this goes toes up, you can use the system restore to put your PC back to a working state. It wont remove all the folders and directories or any files that have been created since the restore point, but it will restore the registry back to the point when you created the restore point.
If you are going to install Diagbox next, ignore everything else you have read on the net about installing it and concentrate on the instructions from Easy. It is easy to get mixed up with other versions with different passwords that wont apply to your version.
- Make sure you have your internet connection turned on throughout the installation as per the instructions.
Follow the instructions precisely and don't skip anything - making sure your restart the PC when advised.
When you get to the updates, again, do them one at a time and restart the PC after each one then launch Diagbox after the PC starts to apply the update. Do this for each update.
Don't worry about plugging in the hardware to your USB until you have applied all the software and updates.
I strongly suggest you only update to 7.65 as supplied by Easy at this stage and get everything working. This will be all you need to work with your car and older models.
During the software installation, you will get multiple requests to allow connections through your firewall - allow ALL of these. Be careful, as these firewall request windows will pop up quite quickly.
When you eventually plug in the hardware, you may again get various firewall messages - allow these.
The only time you need to worry about the internet is when you are undertaking a diagnostic and it might ask you to login. If this happens, press the Red X twice.
Regards
Edited to clarify this refers to Windows 7 and added reference to Device Manager as was in response to Harry specifically
Just making it up as I go along. As usual 
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