error when uploading image (SCCM 2012)

hello all 

i get the following error "the instruction at 0x779f7a1f referenced memory at 0x00000028. The memory could not be written"

when uploading an image to sccm from a precision T3600. Our infrastructure is other wise fine, its just the one model we are having problems with and this was working last January (the last time I installed a batch). Ive seen blogs that get this when someone is creating vms with sccm but not much else. 

all my workstations are Windows 7 x64

Any help is appreciated 

thanks