U might try to check for driver errors,or reinstall them
Make sure the scroll lock button is OFF.
Download the following from the Dell Support Drivers and Downloads page.
Quickset
Alps Input Drivers
BIOS
After downloading these update install if starting with Quickset, Alps Driver then BIOS. After flashing the BIOS laptop will automatically restarts.
After it reboots. In Dell screen hold down the F8 then select safe mode then press enter key on it. Wait until it loads in safe mode. Try working in safe mode if problem persist if not then boot back to windows normal mode by just restarting the computer.
If problem persist in normal mode in windows then i suggest back up your files then perform windows re-installation.
In doing the reinstallation you need to use the windows installation cd came with the computer.
Boot to F12 then insert the CD windows then select to boot to CD the follow prompts.
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