It's a two part problem, your hardware (memory) is not up to running Inventor properly. The differ background updates will help your performance but you will loose the ability for drawings to update in the background.
It will get rid of the green corner hash marks but drawings will be out of date and will update when you open the next page of your drawing. You will need to wait while it updates.
If you were at least on Win7, you could use a thumb-drive for additional memory. Your currently list only 2Gb of memory on your system. This means you will be using your hard-drive as a tempory swap/cache which is extremly slow.
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IV2014 sp1 PDSU / Sim Mech 2014 / Win7-64 EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel 950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller) Nvidia GTX-690 Classified - 331.65 SpacePilot Pro 3.17.1, 6.17.7, 4.11