Privacy Center Keeps coming up when switched

Hello,

I have a acer aspire 7720- 6155, with Windows Vista Home Premium, when it starts, a voice message comes regarding some security system, which is not too clear ,then a screen opens up, with " PRIVACY CENTER" which on the left hand has 3 windows, first saying, Database update error, the second says, Security threat and the third says, License error. On the right side, is "Cookie Privacy Guarder", which says, temporary files (Cookies) are accumulated in the system and different folders keep moving up, It also shows, that security systems needs to be checked, many windows with " PRIVACY TOOLS" windows, open up saying " Not enough storage is available, and then a little window , with "Stack Overflow opens up. Finally a "Microsoft window" opens, saying close program.
After this the screen goes blank. We have to use the on/off button to switch off and the screen shows "Shutting down, which takes some time to shut down.
Would appreciate your help.