Slow computer - no idea how to reinstall windows

I have an acer laptop with OS windows 7 starter. It's a laptop to my boss, I bought so six years ago.

I decided to reinstall windows, because the computer is very slow - cannot scrolling through the pages and cannot open a file unless it goes into "not responding" mode etc...

When I bought the laptop I only had the laptop and the load wire - nothing - no CD

I have a product key on a sticker at the bottom of my laptop. When I get home to check before reinstalling, I get the following message:

«Error: the product key you have entered seems to be for software pre-installed by the manufacturer of the device.» Contact the manufacturer of the software device for recovery options. »

I now have no idea what to do.

I have no technical skills, but I can follow through really good guidelines. Please help solve this problem.

Usually, it's just dust accumulation that causes high temperatures and a slower machine

So the first thing we need to do is to clean it correctly

https://www.YouTube.com/watch?v=ICrEOcjFOOM

If still no joy using free software / utility like ccleaner to get rid of temporary files.

A new installation, you will need the installation of course media and the activation key

If you have these two basic elements

You might look into this it's the new way to update after a clean install.

https://blogs.technet.Microsoft.com/windowsitpro/2016/05/17/simplifying-updates-for-Windows-7-and-8-1/

Or the old method

The manual installation of updates that you have to change your update settings to never check the updates and restart the machine first.

Make sure that KB3020369 is installed, otherwise install it manually.

Win - 7 32-bit

https://www.Microsoft.com/en-US/Download/details.aspx?ID=46827

Win - 7 64-bit

https://www.Microsoft.com/en-US/Download/details.aspx?ID=46817

Then manually install KB3172605

https://support.Microsoft.com/en-us/KB/3172605

Win-7 32-bit

https://www.Microsoft.com/en-US/Download/details.aspx?ID=53335

Win-7 64-bit.

https://www.Microsoft.com/en-US/Download/details.aspx?ID=53332

After your windows update settings back to what you had before, and manually check the updates and the rest should appear shortly.

If you need Visual AIDS to refer to this

http://answers.Microsoft.com/en-us/Windows/Forum/Windows_7-update/Windows-7-update-problems-read-this-first/28147a5f-B0B0-480b-bed9-834a2da7a375

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