|The alarm sound is probably related to a keyboard error. |
Check your keyboard for keys that are stuck in the down position, e.g. one of the two 5 keys.
If that doesn't help, you may need to replace the keyboard.
Laptop keyboards are a frequently replaced item, and there are lots of economical replacements on the web, but you must get one with the right part number.
Search the web for: Dell Inspiron 910 manual -
one of the first "hits" will be the Dell Service manual for your model. That should tell how to remove the keyboard - the Dell part number is usually on the bottom of it. You usually don't need to disconnect it's cable on order to be able to read the part number.
You can make do for most things when the keyboard is disconnected by connecting a USB corded keyboard.
Have you spilled liquid on the keyboard ?
You could try cleaning the keyboard when it's disconnected but that usually doesn't help. Search for instructions on the web. It must be completely dry inside when you connect it again.
"Recently it gives notices that low disk space, but i have cleaned everything"
You need at least a minimal amount of free space on the C partition, say, 10% of the total space.
You get that message when Windows finds you have less free space % than the minimum.
Did you empty the Recycle Bin ?
The files and/or folders listed in the Recycle Bin are not actually deleted until they have been deleted from the Recycle bin. If there are files and/or folders listed in the Recycle Bin, the drive space they occupied cannot be used for any other data.
Did you set your Folder Options in Control Panel - View to show hidden and system files ? Sometimes there are huge system related files that don't need to be there.
E.g. if the properties of the C:\Windows\Installer folder say it's huge, you have that problem.
How to determine which .msp files are safe to delete
Check the properties of the C:\Windows\Temp folder - that can be huge too.
You can use Disk Cleanup to clean up data you don't need, and once it has been run, you can choose to delete all your System Restore restore points except the last one.
(All Programs - Accessories - System Tools - Disk Cleanup.)