Is it safe to uninstall older versions of Adobe Acrobat?

It is safe to remove older versions of Adobe Acrobat?  I currently have:

Adobe Acrobat 8 Prof

Adobe Acrobat X Standard

Adobe Acrobat XI Standard

The reason I ask is I keep getting Update Adobe Acrobat X and it error's off.  So, is it safe to remove 8 and X?

Thanks!