There are a large number of PCs in centres across campus as well is at Halls of Residence and Leahurst.
As a student, you can use any PC Centre across campus, not just those in the Library or your own department's building, provided the Centre has not been booked for teaching.
PC Finder will show you where to find a free PC to use. PC Finder also tells you how long a PC is available, and how to get to find it. You can filter your search for a free PC by the software you need, any accessibility requirements that you may have, or even by adjacent PCs if you want to work next to a friend.
The Harold Cohen Library and Sydney Jones Library also show the availability of PCs at each location on large monitors. Remember: you can use PCs in any PC Centre, not just those in the libraries.