contentiskey on "Lost user name and email address"

I have tried to log in but WordPress does not recognize my user name or password. I am conceed because for other reasons someone was able to hack my computer last week and they may have changed the user name (which is not the one for this forum) and email address settings within WordPress because it was open on my computer at the time of the hack. How do I get into my site without the user name and email address?
Thank you.

do you have access to the webhosting connected to the WordPress powered website? if yes, then you can get access. who is your webhost?