Many spyware programs are written so that, if you try to remove them, they can repair
themselves. Some distribute their files throughout your hard disk in different locations, to
make it harder to find and delete all of their components.
Some spyware turns your business or personal computer into a server that can serve up the data stored on your computer to other computers over the Internet.
Spyware often affects system performance. Like any software,
spyware uses system resources, and consequently those resources are not available for other, desirable programs.
advertising companies have created their own Trojans that install themselves without the
user installing another associated program. These can operate in "stealth mode,"
making them difficult to detect, and can even be written to appear to the operating
system like a Windows system process so you can't terminate it.
According to a recent report from IDC, consumers and businesses are expected to
spend approximately $305 million on efforts to detect and eliminate spyware. Thatís just
the cost of implementing antispyware solutions; it does not include the significant costs
in decreased network performance, employee time and lost productivity caused by the
plethora of spyware programs that infest usersí systems.
Personally though I have spent nothing to fix these problems because I make sure they dont arise but hope this helps any