Where to buy a DVD to instal Windows 7,8,9 in Bangkok ?

Thanking you all in advance. Much appreciated.

Going to have a tough time finding Win 9 anywhere.

Genuine Windows go to a ITCity, BananaIT, or similar large chain stores.

Or just download an ISO from the Windows ISO servers....but you will need a license key to activate them. For example below are couple of Microsoft links to download Win 10 ISOs. You can buy a license from the Windows Store, Ebay sellers, online sellers.

http://www.microsoft.com/en-us/software-download/windows10

http://www.microsoft.com/en-us/software-download/techbench

And an example of an Ebay seller with low cost Windows licenses is at this Link...I bought two Win 10 Pro license from this seller...they both activated. I got them when they were going for approx Bt521...now they are approx Bt808...guess they were selling so good he raised the price on his latest ad. I'm not endorsing this seller by any means...your results may vary....numerous other Ebay sellers selling Windows licenses.

Alternatively, try MBK, Fortune, Pantip, etc.

I read that Pantip was closing for renovation. Have they reopened yet?

I purchased a Window 7 disk, with all the various versions recently.

I was able to install Home Premium on a new computer, sold only with DOS,

and I was able to reinstall my computer with the Professional version

In both cases the versions were marked as OEM and are fully activated

It did take me a little work to find all the drivers, and the fingerprint security

on my machine is still not working.

However the re-install has freed up a lot of space and speeded up the machine

Be careful buying an operating system or software disk as some have viruses.

Personally I'd pay them 300 baht and get one of the stores there to reinstall the operating system

For what machine exactly?

Going to have a tough time finding Win 9 anywhere.

Genuine Windows go to a ITCity, BananaIT, or similar large chain stores.

Or just download an ISO from the Windows ISO servers....but you will need a license key to activate them. For example below are couple of Microsoft links to download Win 10 ISOs. You can buy a license from the Windows Store, Ebay sellers, online sellers.

http://www.microsoft.com/en-us/software-download/windows10

http://www.microsoft.com/en-us/software-download/techbench

And an example of an Ebay seller with low cost Windows licenses is at this Link...I bought two Win 10 Pro license from this seller...they both activated. I got them when they were going for approx Bt521...now they are approx Bt808...guess they were selling so good he raised the price on his latest ad. I'm not endorsing this seller by any means...your results may vary....numerous other Ebay sellers selling Windows licenses.

Correction...the seller has Spanish version going for around Bt808...he still has the multi-language version (includes US & UK English) which I bought going for around Bt521 and still going for approx that.

Be careful buying an operating system or software disk as some have viruses.

Personally I'd pay them 300 baht and get one of the stores there to reinstall the operating system

This why you just download the ISO yourself, check the MD5 hash and write the image to a flash drive with Microsoft's own tool. https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool

The key you can get separately.

Past few years always buy everything from Advise.it many shops around

https://www.advice.co.th/product/microsoft-windows