Unity doens't opens

2 hours later my unity were working pretty fine I restarted my computer and now I have this error:

My computer is a :
Intel Pentium Dual Core 3.0GHz
Nvidia 9400 GT
500 GB HD
2 GB RAM
Windows 7 Ultimate
32 bit SP1
I’m using Unity 3.3 free version.What’s going on?

looks like some of important files were corrupted… have you tried re-installing?..
if using windows 7, sometimes is recommended to install programs out of the program file folder… :wink: