Lightroom 5 crashes

Question

Since yesterday, Lightroom always crashes when being opened, with the note "Lightroom stopped working". It happened for the first time while working with the adjustment brush. Now we can't open LR anymore without a crash. Is there any way to repair the software without losing prior work?
Windows 7, 32 bit, 4 GB Ram

Answer 1

What is "Safe Mode"?
Safe Mode is a way to start up your Mac that performs certain checks and prevents certain software from automatically loading or opening.
Starting up in Safe Mode does several things:
It forces a check of the startup volume, just like the First Aid feature of Disk Utility. You may see a progress bar on the screen during this check, and the computer takes longer than usual to complete its startup.
It loads only required kernel extensions.
It disables all fonts installed by the user.
It moves font caches to the Trash that are stored in /Library/Caches/com.apple.ATS/(uid)/  – where (uid) is a user ID number such as 501 (Mac OS X v10.4 or later).
It disables all startup items and login items in Mac OS X v10.4 or later.
In Mac OS X v10.3.9 or earlier, Safe Mode opens only Apple-installed startup items (such items may be installed either in /Library/StartupItems or in /System/Library/StartupItems). These items are different from user-selected account login items.
Taken together, these changes can help resolve or isolate certain issues that exist on the startup volume.
Sent from my iPad