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XP Pro 100% CPU utilization problem

I've got a PC that is staying pegged at 100% and I can't figure out how to resolve it. The machine is running XP Pro. Two of the processes that are constantly using cpu are lsass.exe and task manager. I have task manager open obviously when I checking this, so I don't know if it is using cpu when I don't have it open or not. Even when it's not open though the pc is extremely sluggish and unresponsive.

Windows won't let me stop the lsass.exe process because it's a critical process.

Here's what I've tried so far:

Run a complete scan with AVG 8.0 free
Run a complete scan with Rouge Remover Free
Installed latest Windows Updates (SP 3)
Logging in as different users to the machine.
Rebooting numerous times.

Both AVG and Rouge Remover found a couple of issues and removed the problems, but it hasn't corrected the cpu usage issue.

I'm running a scan with AVG in safe mode right now and I'm waiting to see the results.

Anyone run into anything remotely similar to this and if so how were you able to get it resolved.


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Re: xp pro 100% cpu for lsass

In reply to: XP Pro 100% CPU utilization problem

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XP Pro 100% CPU utilization problem

In reply to: XP Pro 100% CPU utilization problem

close all programs & open task manager click the process tab & check the cpu usage of all runnung images. Normally "Sytem Idle Process" will range in between 95 to 99. If any thing other than that eats the maximum cpu usage. That is sure to be a virus. Kaspersky will solve this issue.

Also note that lsaass(LSASS) is different from isass(ISASS).

lsass.exe(LSASS) is a system process of the Microsoft Windows security mechanisms. It is not a virus that stays in the system32 folder.

isass(ISASS) is a Optix.Pro type virus which disables the firewalls and other local security protections. It should be removed immediately through kaspersky online scan.

Here is the link:

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