It is very important to remove these because as mentioned
, some will include spywares and most of them run without the user realizing it. They can also dramatically slow down the performance of the computer. Many anti-virus programs have been written that include the detection and removal of adwares, almost all of them in fact. Some may offer a separate adware and spyware removal package. There are also very good anti-virus programs that are free to download which already includes adware and spyware removal.