Hello.. I have a Sony Vaio Laptop with Visa Home Premium since 2 years. Never had any problems and I never used an anti virus also, since its just deals with some company important files and stuff. Dont know, what happened , now when I startup, it opens woth blank screen and no icons, no desktop background, no windows taskbar, nothing. I had to goto ALT CTRL DEL to start the Task Manager and then create the new task as explorer.exe to get my desktop back. Looks like my core windows files are infected with some virus. When I tried to goto Control Panel > Security to switch on automatic updates, it dint let me go there and said , There are some very very important data on this system. All I need now is to first get this data backed up to my Ext HDD , so that I can then sit and repair the system with system restore or vista reinstall or whatever. When I try to insert my USB of Ext HDD , it just doesnt recognize it also. So, whats the ultimate solution now ?