@ first case:
Are you running any kind of firewall, security suite, privacy software or even advanced anti-virus?
Disable all of those, and test the problematic websites again.
@ second case:
Use RevoUninstaller (
www.revouninstaller.com) to get rid of the old version of that software. Apply one of the more advanced modes, but make sure beforehand that the registry backups made by Ccleaner are still available. If not, make your own backup using EruNT:
http://www.larshederer.homepage.t-online.de/erunt/