your Windows Update utility in the Control Panel say? Mine says at the moment, "No important updates available".
In that window, what happens if you click the "Check for updates" in the left hand side-bar? What messages do you see?
I am using vista home premium sp2 32 bit operating system, I have not been able to install updates since 28/01/10, this is the last day a windows update occurred and there is no way to uninstall. I have tried installing updates without antivirus and firewall programs running with no success.