We have windows XP and SP3 installed .We use Spybot and Avast . I notice there is part of Spybot called Tea Timer , could this cause the pc to run slow ? If so ,would it be wise to un-install Spybot or disable , if possible Tea Timer.The slow running is more noticeable in the evening when my son is on usually chatting to friends etc. and cracks him up. Grateful for any advice , maybe time to replace computer??