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Infected and believe it still remains

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#1 optionsmom


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Posted 06 November 2013 - 01:22 PM

Dell dimension 8400 running Windows XP media center, kids play games and Minecraft on it. I believe they tried to download a misleading Minecraft mod file and that started the infection. Minecraft will not run at all on it anymore, but I cannot tell if it is because the latest upgrade is now beyond our RAM or video card capacity, or the computer is being hijacked.

When viewing Processes under Task Manager, often CPU process shows 100%, everything is very slow. Also a "system idle process" sometimes shows 99 when below CPU says 0% which doesn't make sense.

Have run Malwarebytes, Adwcleaner and SuperAntiSpyware. The items that have been shown in these scans were: PUPOptional Babylon, SweetIM, BrowserDefender.A, Sweetpacks, and Delta.a. Also TrojanAgent/Gen-Nullo. Have merely attempted removal using these tools. I have followed the Sweetpacks instructions from that post to attempt removal.

We have the free version of Avast on this computer and have used their basic tools as well. Any help you can offer would be appreciated, I have turned the notifications on to await a reply.

Sincerely yours,
Optionsmom, aka Donna

Edit: Moved topic from Windows XP to the more appropriate forum. ~ Animal

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#2 quietman7


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Posted 06 November 2013 - 08:05 PM

System Idle process is used for measuring how much idle time the CPU is having at any particular time (100% minus the sum of all tasks CPU usage). It accounts for processor time when the system is not processing other threads and will display how much CPU resources, as a percentage are 'idle' and available for use. One instance of this process operates per CPU, and runs to occupy the processor when other threads are not running. System Idle process also issues HLT commands which put unused parts of the CPU into a suspend mode, thereby cooling the processor. Normally this process should take up at least 90%+ of processor time on average (this is the value in the CPU column). In non-technical terms, this figure represents how much CPU time has not been requested by anything else on your system. See Why Is The System Idle Process Hogging All The Resources?,

System is a process in NT "kernel mode" that contains most of the system threads and handles various basic system functions. When Windows loads, the Windows kernel starts and runs in kernel mode to set up paging and virtual memory. It then creates some system processes and allows them to run in "user mode" but restricts their access to critical areas of the operation system.

Every process started by Windows, except for the System process, runs in user mode. The User mode processes must request use of the kernel by means of a system call in order to perform privileged operations on their behalf. Kernel mode has full access to system resources and controls scheduling, thread prioritization, interrupt handlers, memory management and the interaction with hardware. The system process cannot be terminated.

If you're not finding any malware then most likely it is a RAM or video card issue.

Windows XP media center is an old operating system. Slowness and performance issues as you describe are not uncommon, especially with older computers and there are various reasons for this besides malware - i.e. disk fragmentation, disk errors, corrupt system files, too many startup programs, unnecessary services running, too many browser add-ons/plug-ins, extensions, toolbars, failure to clear browser cache, not enough RAM, dirty hardware components, etc. As you use your system it becomes filled with more files/programs and has a natural tendency to slow down and behave oddly so cleaning and regular maintenance is essential. Incompatible browser extensions and add-ons can impact system performance and cause compatibility issues such as application hangs (freezing).

Please refer to some of the suggestions in this guide: Slow Computer/Browser? Check here first; it may not be malware.
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