how upgrade powershell

hi

for install lync server on server 2008 R2 as this link http://technet.microsoft.com/en-us/library/jj205328.aspx

i understand that i have installed powershell version 2.0 after type command that mentioned in link

how i can remove that version of powershell and install new update of version 3.0

i got error after run lync serevr

i put error below