On Windows computer Operating Systems,all types,are especialy not secure,but can be well hardened,enough to allow use of these & most equipment is free,but requires the use to understand & be willing to follow procedures exactly EVERY SINGLE TIME,AND,if you EVER FAIL,to make a new correctly remade account again immedeately.
There are other,mostly free,full computer operating systems which may from scratch be far more secure even unharden though you still need to harden them & in addtion,gives the user the likelyhood of no cleaning scans required for viruses or other problems by the very nature of the constrction of those computer systems.
One part is to harden & clean your computer,the next is to creat methods of secured transmissons of data.
The third,is to create systems of high security for the data itself,which is then transmitted over scured transmission methods starting from a cleaned & hardened computer,& all,to near all of this is from off the shelf,free products now available for downloading & use.
I do know of some of these systems & know of a professtional computer worker willing t ohelp aquire these for you if your not able & to teach you about them & how & why to use them.
Those wanting more info on this please e-mail me,thank you.