Windows Fails to Open on My Dell Inspiron 531 Desktop

I am running Windows Vista Home Premium and every time I try to start my computer it will ask for my log on info and attempt to open. The desktop screen does appear but like within a minute I get a blue screen saying Windows is shutting down due to an error (see attachment) I can get on in safe mode but very limited access and none of my diagnostic tools work... I can sure use the help as I am no PC Guru

You are experiencing what is know as the blue screen of death. Someone will comby and try to help if you furnish us this information
http://www.vistax64.com/crashes-debugging/282419-blue-screen-death-bsod-posting-instructions.html