Virus In Lab's Computer!!!

Hell... was so kin tio tat i will lost all my assignments data file in my pen drive when it was infected with a virus from my lab's computer yesterday during our lab lesson!!! luckily the virusscan is able to delete it eh... only then i got to know i am not the only one.. in fact a few of my friends already got their pen drive infected the day before... really have to do some serious backing up of all my datas...