i had problem of limewire continually restarting after trying to close it, also the task manager would not open, unfortuantly no anti-virus software/spyware remover would fix it properly.As every time i removed it, the problem would arrise when restarting the computer.
i managed to manually remove it-
using a program 'Highjackthis 1.99.0.1' to access the taskmanager list once again, noticing the unusual backround program 'winupdates.exe' i ended the process. as the real update process for windows is'wdfmgr'.
then going to 'C:\Program Files' i also found the file winupdates, which was hidden, after deleting this the problem was gone.

note that the process must be ended before deleting the file.

this will not take in to account for all 851.7 based viruses as they will vary.