svchost.exe and lsass.exe using too much CPU processes

[littlekates]

Someone please help me regarding the above problem. This two .exe files which i belived is a system files, The svchost.exe is using around 41% of the CPU processes and the rest go the the lsass.exe with both of them running and can not be terminate, my CPU always at 100% usage!! My othe PC doesnt seem to do this, But why they using too much cpu resource? Any help would be much appreciated.

my pc is runing on a Pentium 4 1.8ghz with 1gb pc2700 ddr333.

 

[littlekates]

i can understand that but surely it wont using 41% of the CPU processes? Think i might do a full reinstall just to be in the safe side.