how old is it?
seems to be an alienware area 51 (pre dell purchase), most likely the m5500?
if your video is artifacting, the GPU may be dying or overheating
dell/alienware should have the drivers for your notebook...
it is not recommended to install drivers other than the one alienware provides (unless you know what you're doing)
http://support.alienware.com/Support_Pages/Restricted_Pages/driver_downloads.aspx
also i don't think they had an nvidia fx 5500 (only the 5700 and 5600)?
do you mean the m5500 which has the go 6600?
http://support.alienware.com/Suppor...nloads_processed.aspx?os=WXP&cat=&manu=&item=
if you search that page for 5500 it shows the m5500 with either ATI x1600, x700, or nVidia go 6600
also your notebook might have GPU switching with an intel IGP, so you might need an intel driver as well...
you should probably check your device manager or something