Vista security is a terrible virus that can be extremely difficult to get rid of, you are probably still infected.
Download:
http://download.bleepingcomputer.com/grinler/rkill.scr (Warning: clicking the link will automatically download the program) and
http://www.bleepingcomputer.com/down...virus/combofix
Run Rkill.scr. That should allow you to run executables. Then run Combofix.
I did that today on a computer and it worked. Combofix is a powerful program and not something you want to use a lot on your computer but it worked wonders in this case.
After that run tdss killer, you can download it at this site:
http://support.kaspersky.com/viruses...?qid=208280684
If your computer has TDSS, Vista security will just reappear in a few days. Only tdss killer removes it tdss effectively.