LSUFAN51
4 Ruthenium

RE: Dell Inspiron 5000 series extremely slow

Run the System file checker. It scan for any corrupted system files that could be causing problems and fix those corrupt files as well. It also known to fix files related to Memory Management

a) Press Windows key + X key at the same time, select Command prompt (Admin)

b) In the command prompt type the following command: sfc/scannow and press enter

If no corrupted system files were found , then I would suggest you try the following steps:

In command prompt, type the following commands and press Enter after each command....  

DISM.exe /Online /Cleanup-image /Scanhealth

DISM.exe /Online /Cleanup-image /Restorehealth

Run the check disk command to check and fix any possible hard drive corruption.

a) Press Windows key + X key at the same time, select Command prompt (Admin)
b) In the command prompt type the following command: chkdsk /f and press enter