Last night something strange happened to my laptop. I think it may be a virus. I was talking to a friend on Yahoo Messenger and he sent me a link to a well known calender shop. I had a look and noticed the main font was weird but ignored it and then went to google which was also the same odd font. I had downloaded some fonts earlier in the day so I checked FontBook and Arial had a problem so I did what my mac recommended to do to fix it. The font then changed back to normal Arial. I then went to google and now there was nothing. The font had vanished! I checked my word doc and that too had made all my text invisable. It seemed fine if I used a different font though. So I restarted my laptop hoping that would fix it. But it then got to the desktop and images are missing their thumbnails, the dashboard is back to default and if I tried to open anything even my Sophos virus scanner trial it did the spinning wheel thing and nothing happened. I looked online and saw others had this happen so I followed their fixes of restarting and holding shift on startup. This has made things work but some stuff is having problems. For example Safari crashes after a few minutes and when I tried to scan to see if it was a virus it came up with this error. http://www.sophos.com/support/knowledgebase/article/13026.html The shield isn't blue so I rang tech support and they cant help because its a trial version. I'm now at a loss as to what to do. I know on a pc I can restore to a previous date but not a clue how I can do that on a mac. Does anyone have any ideas how to fix my laptop? I'd greatly appreciate any help.