Night ground tectures look gaseous??

At night my ground textures look like "water with gas in it". Thats the best way I can describe it, tried several different drivers and settings but nothing works. Ive also been getting the green water at times.
Any suggestions would be appreciated.
FSX SP1
WinXP SP2
P3 3.2 DC
2 Gig Ram
Geforce 7800GT
veiwsonic 21" LCD (is it my monitor?)
Any suggestions would be appreciated.
FSX SP1
WinXP SP2
P3 3.2 DC
2 Gig Ram
Geforce 7800GT
veiwsonic 21" LCD (is it my monitor?)