Error messsage NPIS.SYS

Hi I have an Acer aspire 1680 and I have been getting an annoying Blue screen error message that pops up every time i enable my LAN to connect to the internet. it works fine for a few minutes then boom comes the blue screen.
The message is as follows:
Driver-IRQL-NOT-LESS-OR-EQUAL

followed by :
0x000000D1 (0XED60258C, 0X00000002, 0X00000001, AXF769DE9F)
NPIS.SYS ADDRESS 769DE9F BASE AT F7685000 DATE STAMP 48025D03

immediately after this message coming up the computer automatically shuts down and again the same problem arises. I have removed and reinstalled the network adapter drivers but have had no luck. I've also gone as far as formatting the computer but still had no luck.
Any help would be greatly appreciated.
Thanks
 
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