I have a HP pavilion laptop which came preinstalled with Windows Xp and am trying to upgrade it with Windows Vista by using the HP upgrade dvds. When I was using the Vista upgrade advisor, then it told me to remove the Windows Powershell 1.0 before going ahead. So, when I was trying to remove it from the Add and Remove programs then window reports that windows powershell cannot be removed. I have tried to search for some solutions for this problem but I cant find anywhere. Any solutions?