Many users report many problems after yesterday’s upgrade to version Lion OS X 10.7.3 .
For example, many indicate that many applications ‘crash’ when you start operating. So, if you experience such problems try this:
Get the combo version of OS X 10.7.3 from here , run it again to install the software and reboot the system.
If things are even worse than that and you can not access the desktop try restore from a Time Machine backup on version prior to 10.7.3 and install through the combo version.
As a last resort should enter Recovery to install from scratch the functional restoring your files later via Time Machine.