I think that when your comp gets straight it`ll install but F8 should let you in safe mode so you can`t get to the setup menu or safe mode . That is not right at all. OK lets make sure you have a clean system to start with go to either of the links provided install update and do a full system scan both are very good and both have a free version. All that`s needed is patience and determination. Do you have a windows startup disk or does your harddrive have a recovery partition http://superantispyware.com/http://www.malwarebytes.org/