I have been using a Gateway NV55S Windows 7 Home Premium for about a year and a half. I haven't noticed any real problems in this time. However, upon closer inspection I've noticed many problems.The Windows Security Center disables itself automatically and Windows Defender closes seconds after being opened. Every now and again, google will redirect me to ads, and following other threads with similar problems, and different programs such as Rkill and aswMBR and Tdsskiller and Malwarebytes; It would seem I have a Win32: Vitro virus and perhaps more. My main concern is getting the security center running and stopping any further damage to my computer. Any help would be appreciated and I'll try to do whatever i need. Thanks.