White noise bursts

[gemada]

Hi.
I've just bought an m-audio fast track mkII usb with pro tools essential 8.0.3.
Even though i have an old and low powered system (under the minimum system requirements for pro tools m-powered 8), everything installed ok and the fast track as a great sound. It works great with my other daws (cubase le4 and samplitude 10 se).
The problem is that i'm having random white noise bursts in playback with pro tools essential 8.0.3...i've tried all the optimizations suggested by avid (except hardware upgrades cause i'm out of money) but with no success...This happens even with just one mono audio track without plugins and latency/buffers set to the higher settings.
I know my system is not supported (celeron m530 processor laptop and just one sata 5400rpm hard drive with 2 partitions) but reading the extensive foruns about this problem i do believe that maybe it's a pro tools problem (i've tried to record 5 mono audio tracks and 4 instrument tracks with cpu usage at 40% and hard drive at 2%...everything seems to work ok except these random white noise bursts).
I've read that with the 8.0.4 update this problem was finally fixed but there is no such update for pro tools essential, so my question is:
Is it possible for pro tools essential users to have the 8.0.4 update?
Thanks