There are many models of the Inspiron 5000.
What is the exact make and model?
Open Start, type: system information
Hit Enter
Click System summary
Copy the system sku into reply here.
Wipe it off with a soft, clean cloth. Use a microfiber cloth if possible.
Select the Start button, then type Calibrate the screen for pen or touch input in the search box on taskbar and then choose the top result. Select the Setup button and follow the instructions.
Type Device manager in the search box on taskbar and then choose the top result. Select Monitors and press-and-hold (or right click) on the name of your monitor. If one of the menu items is enable, choose that.
Repeat step four and then choose Update driver software from the right-click menu.