If anything is blocked, it's through Windows Defender. Go to START > ALL PROGRAMS > WINDOWS DEFENDER. Go to TOOLS up top and click SOFTWARE EXPLORER. Scroll through the list of programs on the left and see if anything is blocked or not permitted and see if you can enable/disable/remove it.
Every time that I boot my wife's computer, (Vista Home Premium) a little warning balloon pops up regarding blocked programs.
Is there a way to stop this? Thanks, Bill