I know this is not an excel problem but someone here has always been able to
solve my excel ones so here goes

Although use NOD anti virus have message keep popping up on window saying
worm.win32.netsky virus on computer

click ok to remove it then opens window to buy some anti ad/spy software.

If i run my existing spyware it does not find anything nor does full scan
with NOD yet webpage readdressed etc

Can anyone tell me how to solve without giving in and buying there software