Problems with dual boot in an old pc (pentium 4) without UEFI

I write all of you because I have expended two weks trying to solve this problem, I have seen a lot of youtube videos and read a lot of forums but I cannot fix this. I want to clarify that I'm only a user but I'm not an expert in linux or windows.I have already installed dual-boot pcs in newer computers but I really really realy need some help! I'm having a lot of troubles trying to have pentium4 pc with dual boot, the idea is to have windows 7 and linux Mint. I also know that it is possible to have a dual OS system in this pc because this pc had windows 7 and it was updated to windows 10, afnter that I installed linux and it was fine, but as W10 was too slow for this pc, I re-installed a version of windows 7 and when I tried to re-install linux, all the problems started. After installing linux and rebooting, the grub does not work and show the grub-rescue message. I have tried all the standard solutions, changing the root in the grub-rescue terminal, using live usb sessions to install and use grub-installer, boot-repair, grub-customize and in windows, grub2win and easybcd2,4 but I always have this problem. I have triend installing the grub in the harddrive and also in the linux partition. I also have formatted my hard drive and installed windows and linux several times and I always have the same problem. When I want to boot windows I have to use bootrec to rebuild the bcd. The pc has a pentium 4, cpu 300GHz, RAM 2 Gb, 32bit and a HD of 160 Gb and I have 5 partitions: - sda1 100MB reserved for the system primary partition - sda2 C: primary partition NTFS for windows - sda3 D. primary partition NTFS for storage - Sda5 Logical partition ext 4, for linux - sda6 logical partition swap I don't know if the problem is because I try to install a recent version of linux and the grub assume that I have UEFi and search for efi . It is that, what would be the grub configuration for a pc without UEFI? (I also have tried to install Mint 14 and a few other light distros) I also have tried with the easybcd2.4 and it allowed me to create a boot menu with windows and linux but it fails to boot linux. I have tried to edit NEoGrub menu.lst file but I cannot find the right configuration. Do you have a sample file that could work for my configuration? I've read that it is based on grub4dos syntax but I have no idea about this. I want to resume my questions: - Is it different the grub.cfg file for PCs without UEFI? If it is different, someone could provide an example ( or help me to create) a grub cfg file for a dual windows-linux ? - I think that it could be easier to change the bcd configuration using the correct menu.lst file, someone could help me to write an appropiate file for my configuration? - If I'm doing the things in a really wrong direction, could you please show me how I could install the two OS and which version would fit more with my pc? - Do I need to provide more information related to my boot problem? How could I get it? - Could this be a problem related with windows and I should need an specific version? I want to sincerely thanks to the people that will take their time to read this message and for the comments and ideas that you could have.