Computer really slow and 100% cpu usage all the while

[Thebug]

My laptop has gone slow all of a sudden, in device manager the cpu usage is on 100% all the while and its a process called lsass.exe causing it.

It also make my internet stop working.

got an idea it might be a trogen or virus - whats the best program to scan with to check?

thanks

 

[Thebug]

this is how its spelt

i have run counterspy and that did find a trogen - i deleted that and it doesnt find any more.

 

[Thebug]

Right i have 2 lsass.exe processes running both spelt the same one is a system process and the other is a user process - any ideas please

 

[Thebug]