Using a Retail Win7 Disk - called MS, still confused

Sorry I know this must have been answered a million times but -

The HDD in my laptop is clicking -it's near death. So I need to install a new HDD and put another copy of Windows 7 Home Premium 64-bit on it (exactly what the system came with). The sticker on the laptop has the product key and MS said I could use that. So far so good.

Now I need a copy of Win7 Home Pro. I have Win 7 Pro disc that I used on my workstation. Can I use that disc - instead of downloading an ISO/burning to DVD - to install Win 7 Home Pro 64?

The reason I ask is because I'm sure I read many times that retail discs contain all the versions of Windows 7. Although I used the disc already to install Win7 Pro - can't I use it for Home Premium as well?

Thanks you guys - I appreciate any help you can give me. MS customer service was prompt and friendly but unfortunately the language barrier prevented us from understanding each other I think.

Thanks again!

I think you can follow this tutorial. Never used it, but I think it's what you need:

Windows 7 Universal Installation Disc - Create

But I think it requires a burn, so it just might be easier for you to download and burn Home Premium and not have to work through the tutorial.

hey that's great IG - the first sentence told me exactly what I wanted to know.

apparently the retail Win7 DVD will only install the specific version on the label.

I d/l a copy from digitalriver - on instructions from MS customer service - so I should be good to go. I hope so!

Thanks again!