Occasionaly "Server execution failed" error may appear

For Vista Home Basic/Premium:

Open Start menu and in the quick start field type cmd. Then right click on the cmd icon and choose Start as administrator. Then type following string in comand prompt: net localgroup "Administrators" "NT Authority\Local Service" /add

and press enter. And restart computer.

For Vista Ultimate:

Right click "Computer"
Click "Manage"
Under the "System Tools" section, Double click "Local Users and Groups"
Click "Groups"
Right click "Administrators"
Click "Add to group..."
Click "Add"
Click "Advanced"
Click "Find Now"
Double click "Local Service"
Click "Ok"
"NT Authority\Local Service" should show up in the list now
Click "Ok"
Close Computer Management and reboot.