The virus that Infects Files - that laptop virus typically latch on to the.Exe or.Com documents which can be files that comprise the instructions to open up software or software. Once the software is opened, the pc virus will spread to different programs. Overwrite Computer Virus - This is a kind of computer virus that corrupts documents by overwriting it. This approach that the document becomes un-open in a position, and you haven't any different choice but to delete the report or worse, reformat your entire computer.