Sorry to hear you are having trouble. I will help you now.
What is the make and model of this computer?
Also, how exactly did you delete windows? Did you format the hard drive?
If you deleted all partitions, including the restore/recovery partition, then you'll need either recover CD/DVD discs , or a Windows 10 installation DVD.
First, I would check to see if you can find any recovery CD/DVD set you may have gotten with the computer. If you have those, use those first instead of trying to download a Windows 10 ISO.
If you are unable to find this, you can go to the link below, and download an ISO image file of the Windows 10 installation for the version of Windows 10 that this computer originally shipped with. I've also included a link to download imgburn, as you'll need to use that or another program to burn the ISO file to a recordable DVD.
If you have any other follow up questions on this, please let me know. I continue to help before and after rating until you are satisfied.
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Also to note, you will need to use another computer with a CDR/DVDR drive, and some DVDR blank media (blank discs) if you need to download and burn a Windows installation disc. Most modern computers have the drive, and the media can be purchased many places, including office supply stores.