You are right Ashiq. But I know, to implement this successfully we need to start appropriately using of Social Web. You know that anyone could get course materials, assignment date, quiz date, etc through this way. So, we should connect with this facility to keep update and our authority should come forward to implement this successfully. And than make password protect the entire PC with anti-virus (it could be kaspersky corporate version to use same anti-virus for multiple PC). You could use this only on the day of presentation. This could be one way to protect.
Second, it is essential to remove the entire virus from PC than setup an anti-virus (it could be kaspersky corporate version to use same antivirus for multiple PC), than make password protect. If our IT department think they could also do a think that is, from the entire PC you could use Pen drive/ CD, you could also use Internet (mainly 2-3 programs will run, no one can enter even my computer). You could easily give your presentation.
Hope, through these steps it is possible to protect our PC and authority may think about this.