Oh, I wouldn't have deleted CCleaner until it was identified absolutely as the culprit, I kept it on just never ran it.....never mind, easy enough to put it back on later.
What browser do you use? I've had some problems with Firefox 220.127.116.11 in Vista Premium....just got an update to 18.104.22.168 which included some changes to dll's.....if you have been using Firefox it may have been the culprit....see what happens when you get updated to the latest version.
I know Lake Macquarie really well, my wife and I lived in Blackalls Park near Toronto for almost 20 years.....still got a lot of friends in the area as well as relos. We are now retired to sunny Queensland (Bundaberg)...and loving it!