Howdy Old Rusty Bucket,
Here are a few things that I feel may help resolve the issue you are experiencing.
First if your OS version showing in your post is accurate, then update to 10.7.5 with software update.
OS X: Updating OS X and Mac App Store apps
Then I recommend resetting Safari:
Safari 5.1 (OS X Lion): Reset Safari
Resetting the PRAM:
About NVRAM and PRAM
Reset the SMC:
Intel-based Macs: Resetting the System Management Controller (SMC)
and lastly try performing a Safe Boot:
Mac OS X: What is Safe Boot, Safe Mode?
All the very best,