Sandboxie is free and runs your browser in a sort of box completely separate from your computer. Whenever you're done with your browser simply delete all contents to remove any viruses or cookies lingering in the sandbox. However, you don't even have to delete the contents if you don't want to because whatever you do in the sandbox, stays in the sandbox. :)
Download the free version and create a not ( ;] ) fake identity then simply click fill forms and it will automatically fill out all of the not fake ( ;] ) information that you set such as: first name, last name, address, zip code, gender, ethnicity, etc. This will save you a massive amount of time.