Software

I have two questions:
1. Recently my user just downloaded and installed some kind of software, but end up the PC needed to reboot and he could not get back to the windows. It kept rebooting when it gets to the logon window. I had tried many different ways to window. I finaly i got in the window by using safe mode, and uninstall the software but it still doing the same thing. This is the 1st time i have seen.
2. Do you know any third party software that allow to remote and deploy software remotely. I had use the SMS but it requires so much document to read. Some thing is simple and easy for any one can use.
I greatly appreciate for your response.