Trouble reinstalling Norton Antivirus

I hope this is the right place to post... I've been hyjacked by something and it has taken over my browser, disabled my Norton Antivrus, Spyware Docter.... I tried uninstalling them and now it won't let me reinstall....... please help!! Thank you...!

 

[edit: Changed subject to reflect user issue.]

Message Edited by shannons on 05-28-2009 12:44 PM