old slow computer low resources - upgrade NIS 2011 to NIS 2012?

Like the "Subject", would upgrading make much sense?  The old machine is slow.  NIS 2011 works fine, but sometimes computer use becomes slow and occasionally Internet Explorer or Firefox become stuck, or while updates are happening I must not run other programs or computer runs too slowly for these concurrent activities. 

 

The machine is Windows XP sp3 laptop (Toshiba),

2.0 GHz Processor, about 17 MB disc space free,

512 MB RAM.

Also present: Malwarebytes v1.6...(?)

IE8, Firefox 10.0.2, Pale Moon 3.6.30, Comodo Dragon 17.4.1