My laptop keeps posting low disk space. how can I fix this?

Is there any free space left on the same physical drive with this E partition?
If there is enough free space left, simply apply partition resizing software to help you remove this low disk space problem, like:
http://www.resize-c.com/
NO matter what happens to you, simply back up all partition data well and follow the guidance carefully to add enough space to your E partition.

Have resolved this low disk space problem? If not, just follow this vide tutorial to see whether you can still expend this partition space with the free space of other partitions:
https://www.youtube.com/watch?v=6jCeT7CbsKk
In case of data loss disaster, simply save copies of everything important on another computer drive.

How many ways have you tried to remove this low disk space problem? Extend your partition space successfully?
OK! If you've not, this article that talks about how to extend partition space could give you some clues:
http://partition-magic-free.com/windows-server-2003/extend-c-drive-windows-sever-2003-with-partition-magic-free.html
Simply follow its steps and description to see whether it can work for you.
Remember to save copy of all important partition data on another drive before the extending process.

All right! Still receive a low disk space posting? Don't worry! What version of Windows do you use? If it is Windows 7, 8 or higher version, just check whether there is free space on the same physical drive and extend this partition space in Disk Management.
But, if it is Windows XP, you'd better use some partition resizing tools to help you, like:
http://www.partition-magic-server-2003.blogspot.com/2013/11/resize-server-2003-partition-free.html
Or if there is no enough free space left on the same computer drive, just buy another larger drive to instead the original one.
No matter which way is practical for you, just firstly back up all your partition data well.

When your E drive running out of space, you need to expand it to fix the low disk space warning. You can use AOMEI Partition Assistant to allocate free space from other volume to your E drive: http://www.disk-partition.com/resource/free-partition-magic-for-windows7.html

http://www.extend-partition.com/help/allocate-free-space.html

You need to delete items to free up space. Not much else, but maybe run a defrag and disk cleanup.