Hiding Quick Launch in SharePoint

Hiding the quick launch in SharePoint can be done in a number of different ways but the easiest way is by overriding the current css class implemented by "Quick Launch"  in Content Editor WebPart (CEWP) :

Paste the following code in a CEWP and it will hide the quick launch bar :
SP2010
#s4-leftpanel{
display:none
}
.s4-ca{
margin-left:0px
}

SP2013

.ms-core-navigation { DISPLAY: none }
#contentBox { margin-left: 0px }

Delete a list in sharepoint 2010 using powershell

Deleting a list through UI is sometimes a hectic job when your server is slow, so a better approach is to delete the list using powershell. This method is much faster and reliable :

$site = Get-SPSite <Site Collection Name>
$web= $site.openweb()
$lists = $web.Lists
$getList = $web.lists["ListName"]
$getList.Delete()

NOTE : Replace <Site Collection Name> with your current Site Collection Name.
            : You should have required access over ContentDB to delete the list using powershell.