Please refer to KB articles
http://support.microsoft.com/kb/918899
http://support.microsoft.com/kb/923762/
Workaround: please follow these steps
To work around this problem, follow these steps:
1. Start Internet Explorer 6.
2. On the Tools menu, click Internet Options, and then click the Advanced tab.
3. In the Settings box, click to clear the Use HTTP 1.1 check box under HTTP 1.1 settings, and then click OK.
To remove KB918899 from your system
Go to Add/remove Programs (Start > Settings> Control Panel > Add/Remove Programs) Up the top there should be a box that you have to put a tick into called "Show updates", tick that and it should give you all the updates that you have installed there. Highlight KB918899 and select remove.