Usually when LabVIEW crashes you get a crash report and with it you can select "Help->Investigate Internal Error...". This takes you to a page with possible solutions as well as an option to email the crash report to NI.
A few questions: Does this happen on just one computer? When you did a reinstall was it a completely clean reinstall? In other words, when you uninstalled LabVIEW did you also delete the entire National Instruments directory? Before reinstalling, you should try to delete the labview.ini file that's in the main LabVIEW directory and then relaunch LabVIEW to have it create a new one. Corruptions in this file tend to cause problems. Also, what OS are you using, and what are your computer specs?