Computer labs are on all floors of the Engineering Building, some of which are reserved for specific classes and departments while others are open to any engineering student. Some computer labs are open 24 hours a day, except during football games and holidays. There are also ways to remotely access your engineering account from your personal computer at home, but it is not possible to run some of the more intense engineering software.
There are also some engineering labs in Wilson Hall as a part of the CoRe Experience, which are for intro engineering classes (EGR 100, EGR 102) and students. On of the benefits of living in the CoRe Experience is that there are engineering computers and printers in your dorm, so don't have to go to the Engineering Building or even leave the building to do your homework. As the weather gets more intense, avoiding the cold becomes much more alluring!
If you want any more information about DECS, visit their website: http://www.egr.msu.edu/decs/