Hi Mark
Having tried numerous things on my friends PC i.e. deleting chrome (wouldn't let me) numerous Lite Tweaks and Timeshift (system restore) options without success I found the easiest option was to reinstall Linux Lite from scratch HOWEVER, as I had done the original installation on my friends machine and created their home directory on a different partition this was a relatively straight forward process.
If you don't know, or are not sure, what any of this means and you have data that you cannot afford or do not want to loose then DO NOTHING ELSE UNTIL YOU HAVE DOWNLOADED THIS DATA TO A SEPARATE USB or HARD DRIVE .
If the laptop is to be used exclusively as a Linux Lite machine (highly recommended) then I strongly suggest that you spend time reading the LL help manual and also watching the following You Tube video several times over until the principals all begin to make sense to you and then install LL to the machine, complete with the separate grub, boot, swap & home partitions which will make for a far more efficient installation, both for now and when upgrading in the future.
If all this sounds somewhat daunting at this stage - it certainly did to me - trust me, it will all begin to make sense providing you take your time and keep reffering to the manual and YT video as you progress.
I came to LL from Windows XP and just want to use my PC to carry out my work and have no interest in learning how to program or even understand the intricacies of how Linux works but the support I have received from Steve F, Jerry and others on this forum when I've hit a problem that I didn't understand has been second to none and very much appreciated and it's nice to hopefully be able to assist someone else in their journey into a great operating system