A g eneral enquiry

well  here goes i hope that thsi equest doesn't fall on deaf ears. i have prolem with my desktop and a laptop in tha they r bo   th not working correctly. i have parkinsons dsease which means i have to takehtigns slowly and so far today i ahve ben going round in circles. i have a desktop up stairs and it used to work ok but not anymore and i would like to get it going again but am unable to gte it to startup properly. i also have a laptop  which use dt work on windows 10  pro but fros ome nknonw reason it now starts up using windwows 9. so this is ausing me havoc in that  i am unable to ascertain if it is working with windows10. could some person please help me