Outdated browser plugins create vulnerability holes, Firefox users can check if their plugins are up to date here.
Also take a few minutes to run a scan at Securia Software Inspector
# Detects insecure versions of common/popular programs installed on your PC
# Verifies that all Microsoft patches are applied
# Assists you in updating, patching, and protecting your PC
# Activates additional security features in Sun Java
# Runs through your browser. No installation or download is required
