Ive just tried downloading and installing the standalone SP1 for vista 64, but still the same......downloaded, started to install (went up to 50% straight away) sat there for 15 mins, then completed on green bar, window then disappeared from screen.....no sp1 installed!
Could some of the updates already installed be causing the problem and would it be wise to uninstall all the updates in 'installed updates'?
Try these steps,
1. Click Start – Search for Services.msc and press enter.
2. In the right-pane, scroll down to the “
winHTTP Web Proxy Auto Discovery Service“. Right-click and select “stop”. and make startup tye as disabled
3. Now, start sp1 installationand should run without errors this time.