a few days ago, while on AIM, i got sent a link by someone who just logged on, sent me the link, and then logged off (that person later told me that they were never on AIM that night). Thinking it was a link to something to do with homework or an interesting picture, i clicked on the link. It sent me to a download page and i downloaded it. I clicked it, but nothing visible happened. I checked the file type and it said something like MS-DOS file (something like that). Because it didnt do anything, i just deleted it. Ever since, my computer's been randomly restarting (usually after it comes back from standby or from being off). don't know what to do.