I came home one day and lightroom doesnt launch
Ive uninstalled and reinstalled
followed some instruction on the site to rename folders with old after it
Windows 10 32bit
Which version are you using?
Lightroom CC2015 is not compatible on 32bit machines.
Not sure how you installed it on Windows 10 32bit.
Could you confirm your operating system details?
And if you receive any sort of error message at launch?
Check if the processes in background in task manager.