>>>Hi,
>>>
>>>I am considering upgrading my Windows 7 PC (which I use for all my development) to Windows 10.
>>>I bought this Dell PC in 2013, replaced the hard drive to SSD drive some years later. So, as far as the hard disk, I know it has enough for the upgrade.
>>>The PC has 16 GB of RAM.
>>>Processor: Intel Core (TM) i7-3540M CPU @ 3.00 GHz.
>>>
>>>Two questions:
>>>1. What do you check on this notebook to make sure it is compatible to Windows 10?
>>>2. I I choose to reformat the drive and install Windows 10 from zero, does the pc/notebook have enough power to run it?
>>>
>>>TIA
>>
>>Windows will check that it can run on your machine during installation. My best suggestion is to replace the HD with a SSD, it's much faster and now they are cheap. That gives you the option to use the old HD for backup, or you can re-insert it.
>>
>>And yes, I'm sure that your machine is powerful enough.
>
>Thank you for your message. I already use/have the SSD drive on this computer.
>Now I am deciding if I should reformat and install every program I have or upgrade.
>I would love to hear from those who upgraded Windows 7 to Window 10 and see if they had any issues.

I have done both, but a clean install is much better since you most likely have a lot of garbage on the old HD. As I wrote, I always buy a new SSD when I do a new installation on an old machine. That lets me use the old HD as for instance E: and check whatever you forgot to write down, or copy some files which stores important settings. Later you can buy a USB enclosure for the old HD, and use it an external drive.