recovery drive

Hello , 
 recently I bought for around 200 $  an old Dell Inspiron 5040 laptop. During pandemic kids are having lessons trough internet , so that one should be enough for it.
 When it arrived next day crashed. I tried to use recovery. It should have there Win 7 home premium OA.
It is impossible to start recovery using the F12 function because only the boot for individual devices is visible.
When I booted up the system using various tools, it turned out that it is not original or even 64 bit as it should be.
I`ve checked that the Recovery partition exists, but probably during the installation of the "strange" win 7 the Dell Utilities partition was overwritten and the Recovery partition was shifted by a couple of clusters. At least that's what I concluded.
I tried to use the Dell backup and recovery tool I downloaded from the internet, but it does not see the recovery partition.Dell's other system repair and download tools fail to install, possibly due to a version incompatibility of the system.
Even the WAIK that I downloaded does not start in any possible configuration at this system.
The laptop is equipped with the Windows 7 home premium OA license number and attempts to download the dedicated software,have failed due to Microsoft's rejection - as it happens, when they sell the license to the manufacturers of the laptop,
so microsoft have asked me to report to producer. Unfortunately, this product is too old for that and no longer has support from Dell.
The Dell site refers me to online help. I started DMDE, the program finds and sees but as inactive 15.7 Gb recovery partition and about160 Mb DellUtility partition. To copy all sectors I need 320 GB to make sure it will copy everything that can be scattered all over the hard drive, and I m not sure it will work , just by copying it back. Previously, I only used DMDE for data recovery, but I did not copy entire sectors. The data could be recovered when it comes to the Dell Utility overwritten by "strange win7 ", you can probably recover the entire recovery, but it is scattered across 4 different partitions
visible in DMDE, so I did not clone the whole thing and I'm afraid I don't know enough about it to do it good.
I'd like to repair an existing system with a factory reset.Or at least get a working Windows by using oryginal version. If anyone can help me with it I will appreciate it .