no it is not.
it will depend on the virus, but to be safe it isn't a good idea
those virus can send information regarding the places you visit online, what you type, save, and view... etc.. so if u was to enter addresses, credit card numbers, etc.. they can obtain those information and use it..
so the best thing to do is to run an antivirus and antispyware on your computer first. if u want the best possible clean up, after that, u can post a hijackthis log and the members here can help you out.