my pc has gone mad i turned it on the other day and a m essage came on saying rundll problem with a big red x all so the was a message from windows antie virus 2009 saying it it not working and the updates are switched off then it is asking me to register it but i got the pc second hand and i do not have any so tge mite be a problem with windows security all so i get loads of programs that just come on even with a pop up blocker on ans i can only get on a few web sites as it comes up can not find server i can use my my emailbut CAN not get on to the dal web site so i have had to use my daughters pc can any onehelp me as i have not got a clue thanks my email is xxxxxxxxxxxxxxxxx.

Post edited to remove email address. Dan Penny

You have been infected with the WinFixer virus.
Very hard to almost impossible to completely clean your system.
It all depends on what other malware it has already installed.

Best to disconnect that computer from the internet to prevent further infection.
This infection is polymorphic. It installs several files that display the red X and changes your wallpaper. It also has a file that downloads more viruses into your system.
It will also attempt to get you to send money to buy Windows Antivirus 2009.
Do not 'buy' it!
They will take your money and not sell you anything other then a bogus scanner that says it is clean.
Being polymorphic means that if you do not get rid of every file associated with it, it will rebuild itself.

You can attempt to remove it by first turning off system restore.
This needs to be done otherwise when you reboot with system restore turned on the system will reinstall it.

Now follow the directions found here;
Remove Winfixer

Good luck!