Dell Inspiron 519 desktop dual booting (on separate disks) W7 HP x64 sp1 and Linux Mint Mate 19.2, recently installed. When powering up, a grub screen displays to offer a choice between the two systems.
Over the years, W7 has been taking longer and longer to boot fully- it now takes just about 4½ minutes to reach that point. By comparison, Mint gets there in about 50 seconds. (I have noticed that in general the Mint OS is much faster at responding to commands than 7.)
Various scans for malware, viruses, etc. have always come back clean, and we have used Emsisoft Anti-malware for some time. Could be that there are too many services or processes that are enabled at startup but I don’t know which ones are extraneous and which are needed.