you say when the 'new card was put in' which suggests to me either a hardware issue or possibly a driver issue.

what wattage is your power supply? the card you have require a minimum of 400watt psu.
if you have less and put the pc under load something will have to give and my thoughts now lie here.
the ram will certainly make a difference and help long term but check the PSU first

when you installed the new card did you run a driver cleaner (best in safe mode) before installing the new drivers? (windows 7 has a habit of automatically installing generic drivers which may conflict)


do try the game with lowest settings on everything if it loses the blue colours then it must be hardware related in my opinion.