When browsing through Ebay, a popup appeared saying I needed to download anti-virus software and I could not get rid of it as it kept popping back up when I clicked it off. It asked me if I wanted to continue unprotected and I clicked 'OK' because I already had Avast antivirus at the time. I downloaded spybot search and destroy to make sure and it promted me to restart my computer. As I did this, it came back on but my computer background had been changed. The background now has a blue background with a binary pattern. It has red and white text saying: "WARNING! YOUR'RE IN DANGER! YOUR COMPUTER IS INFECTED WITH SPYWARE! ALL YOU DO WITH COMPUTER IS STORED FOREVER IN YOUR HARD DISK. WHEN YOU VISIT SITES, SEND EMAILS... ALL YOUR ACTIONS ARE LOGGED. AND IT IS IMPOSSIBLE TO REMOVE THEM WITH STANDARD TOOLS. YOUR DATA IS STILL AVAILABLE FOR FORENSICS. AND IN SOME CASES FOR YOUR BOSS, YOUR FRIENDS, YOUR WIFE, YOUR CHILDREN. Every site you and somebody or even something, like spyware, opened in your browsers, with all the images, and all the downloaded and maybe later removed movies or mp3 songs - ARE STILL THERE and could break your life! SECURE YOURSELF RIGHT NOW! REMOVE ALL SPYWARE FROM YOUR PC!" I have typed this exactly as it is written with all of the mistakes. I have tried various anti-malware software since but none can find any malware on my computer. I am using Windows 7 and if I go onto the 'customize...' part of my Notification Area, it shows all the usual programs/services but it appears to have a new unknown exe file that I cannot find even when I searched it on the internet to find out what it is. It is called 'mEgGeNb06308.exe' and I do not know much else as I'm not a computer expert. Please could someone help me to understand what is happening with my computer and how to remove any malware if it exists. Thank you ps. I have uploaded a picture of the desktop and the 'mEgGeNb06308.exe' that I have found desktop.bmp