I'm getting annoyed by my Mac. My Windows 7 laptop seemed to work far better than my 13" Pro, and it's doing my head in. Since I've had it, Photoshop CS5 lags a lot, and doing certain things within the application can make the whole computer lag. I'm also getting a glitch with with the brushes where I'm unable to access the menu, because when I click Photoshop for some reason thinks I'm drawing on the canvas, and I have to keep on editing my work. Anyway, these are the problems with the actual Mac. I went away at the weekend and connected to the secure wifi there perfectly fine. No problems. I got home and was using it like normal. I had to go to university the next day, but was finishing off some work in the morning, and had to take my MacBook into university with me. It suddenly came up asking to install updates, and I started downloading them until I realised it was going to take about 40mins, and I had a lecture in 10, so I cancelled it. I get to university, and try and boot up my Mac. It crashed on the loading screen, with the Apple logo and the little spinning ring thing. I turned it off, and then back on. It came on. I tried to connect to the university network. It said it connected, but usually, with Windows laptops, when you go to your preferred browser a 'Secure Login' page comes up, where you enter your university credentials. This didn't happen for me. I even go the URL for it off a friend and it wouldn't allow me to connect at all. I went through the internet wizard thing that's on OS X and in the end it came back saying my Mac wasn't connected to the wifi at all. So that's the first problem. Then Safari stopped working for me, and it still won't work. Each time I try and launch it, it crashes, so I switched over to Chrome. I still couldn't connect, so Chrome suggested I look at my Firewall settings. I did that, and low and behold, my Firewall has never been on, even though I was told when I bought my Mac 'everything' had been set up. Any idea's how I can fix these problems? And would the Firewall being off whilst I have been away cause any problems? Thanks.