Problems with editing

I've filmed the majority of my music video at this point, there is however a small problem. The SLR camera I'm using (as mensioned) has 1080p resolution when filming and currently the school computers do not have the proccessing power to cope with the size of individual files let alone a draft or full version of my video, so therefore I must use my own laptop which does have enough power but currently not excellent editing software so I must either download some or use the MAC at school. However the software on that also has lesser software next to the PC's and there is only one MAC in the media room and other people are filming in HD which means they will need to use it as well limiting my time, So my best option at this point is to download software for my laptop.