CPU Usage at 100% when no programs running

Answer 1

That is most likely due to too many apps starting up at the background. Try stopping some of XP user services

click on start

click on run

type in MSCONFIG

and press enter

you will get system configuration utility

click on services tab

at the bottom there is a box which has a message hide all microsoft servicies

put a checkmark in that box and then uncheck all boxes which you think is not a programe you use

once you do this click on apply

then click on close

you will be asked to restart the system

just restart it

now you will get a message regarding system configuration utility

do put a check mark in the box which says do not show me this message in future

then click n ok

your system should work fine.

Answer 2

It appears to be a version of an old virus called sasser worm and it affects a process similar to lsass.exe but with an extra character in the name. The 60 second countdown is an indicator to the type of worm. A virus scan can detect and name it and should be sufficient to clear it - if not it will cause inconvenience but will not damage the software on the computer. If not cleared, then I can describe a simple process which can delete it - it was successful when I had the same worm some time ago