Hi,
Dell only support and supply Drivers for that model number up to and including Windows 7 32bit.
http://www.dell.com/support/home/us/en/04/product-support/product/vostro-1015/drivers
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Whenever you want to upgrade a machine with Windows 7 to a later uperating system, these are the things that you haver to check first:
Follow these steps before you buy and Upgrade (clean install) to Windows 8.1; extended support ends January 10, 2023 .
Check to see if your Computer/Laptop Manufacturer has Windows 8.1 Drivers available for your Model.
If not available, Windows 8.1 will not install and work correctly for you.
"Windows 8.1 system requirements"
http://windows.microsoft.com/en-us/windows-8/system-requirements
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How to buy Windows 10; extended support ends October 14, 2025 :
http://www.microsoftstore.com/store/msusa/en\_US/cat/Windows/categoryID.70036700
But first make sure that you have the correct system requirements and that your Computer Manufacturer supplies the correct Drivers for 10.
https://www.microsoft.com/en-US/windows/windows-10-specifications#sysreqs
"Windows 10 System Requirements"
https://www.thurrott.com/windows/windows-10/3884/windows-10-system-requirements
"Windows 10 FAQs"
http://www.microsoft.com/en-US/windows/windows-10-faq
Cheers.