solved the problem on the forum of Vistaheads.com:
1. Disable Windows Update
a. Click on start
b. Click on all programs
c. Click on accessories
d. Click on Run
e. Type services.msc and press ok
f. Right click on "Windows Update"
g. Click on stop (Windows Update is now disabled)
2. Rename Software Distribution folder
a. Navigate to: C:/Windows/
b. Find the folder named: “SoftwareDistribution”
c. Rename that folder to something like “SoftwareDistribution.old”
d. Create a new folder called “SoftwareDistribution”
3. Enable Windows Update
a. Click on start
b. Click on all programs
c. Click on accessories
d. Click on Run
e. Type services.msc and press ok
f. Right click on windows update
g. Click on start
If you are unable to find Software Distribution Folder, follow these
steps before #2 above.
1. From the explorer window press the Alt key to view the file menu.
2. Click Tools
3. Select Folder Options
4. Select the View tab
5. Select “Show hidden files and folders”
6. Remove the selection from “Hide protected operating system files”
7. Click OK

Restart your PC and you should be good to go!