First of all let me know your computer configuration and which operating system did you install on your computer.
you may also try to run sfc /scan on your computer. it will scan the files and boost little speed. here is the process to run sfc /scannow file.
1. click on windows icon
2. type cmd in the search box.
3. right click on command prompt and select run as a administrator.
4. finally you need to type the command sfc/scannow and hit enter.
it will start scanning your system files. this may take some time. once it will be done then you can restart your computer.