Although not done what is suggested there it helped to find the way to solve the problem, as follows: a) from DeviceManager -> Show hidden peripherals disable Tdssxyx.sys where xyz are random characters (found on non plug and play peripherals) c) REBOOT SAFE MODE (press F8 while Windows boots) no command prompt d) move to Windows\system32 and NOW the tdssxyz.xyz files become visible!! Deleted them all. e) move to system32\drivers, deleted tdssxyz.sys f) reboot safe mode (?) and unistall the peripheral driver tdssxyx.sys g) reboot normal - deleted all what possible from registry - search tdss (all values) if and when found -> delete h) Scan MB did not found any tdss anymore !!! Neither tdss.sys has been installed nor process explorer (www.sysinternals.com) finds any handle or dll attached. Victory Seriously thinking to upgrade to MBPro, MB has been the only malware fighter capable of removing AntivirXp 2009. The rest is ordinary routine. I want to thanks all the people spending their time to give me this help that solved (almost I think so) the infection. THANKS YOU ALL