Windows 7 Pro running problems

My machine runs with an I5 processor with a 2GB Invidia Geforce Graphics card on Windows 7 Pro. I was running Autodesk Revit 2014 (a 3D architectural program), Adobe Photoshop, Illustrator and 2 folders were open. The machine suddenly running much slower, I saved and closed all the programs and restarted. When it restarted "Intel RST service" was not running and an error message showed up ("Server Busy" - This action cannot be completed because the other program is busy. Choose ' Switch To' to activate the busy program ans correct the problem), I did this and nothing happened. None of my programs wanted to run. Since then I have forced the machine to shut down a few times, but nothing has changed. Task manager doesn't open either. Please help!

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