I have a computer with a strange problem. It's an old laptop running Windows XP which is used occasionally by my family. Everything was OK until a few days ago, when a friend borrowed the computer from me and brought to his home for a day. He tried connecting to his home's wireless connection, but connected to a random open wireless lan, which claimed to be "free internet hotspot". No internet access was granted though. The computer came back to my home on the same day.
Since then, the computer is extremely slow to boot up and very very laggish when using. Also, I can't shut it down normally. The task manager shows me the "SYSTEM" is using ~95% of the CPU, and I guess it's because of that it is so slow. I can't access the Internet either (browser crashes when I enter any address).
I've been looking around trying to find more info, and what I noticed is that if I disable the wireless (button on the laptop) before turning on the computer, the CPU usage on idle is ~20%, and I can shutdown the computer and work with it normally (well, it is still slow to boot up; other than that, works fine). If I switch the wireless to ON, I immediately get the CPU to ~90% and it won't go back down, even if I turn it back off later on. Also, the Internet Explorer crashes if I try to visit sites other than the start page (google).
I also get a Windows - No Disk error every once in a while, at boot up.
I posted this situation on the Malware section, and maliprog was kind enough to help me out with this. We reached the conclusion that the computer is clean and it must be some configuration problem. Maliprog advised me to post here on this forum. I leave you the link to the details and what have we tried so far. Might be useful for pointing out other symptoms. For instance, some diagnose programs didn't run at all or had problems (GMER, RKLookUP, ComboFix).
Here's the Malware thread: http://www.geekstogo...u-usage-on-idle
Any advice on fix this would be mostly appreciated!
Edited by Gnitrops, 09 February 2011 - 02:55 PM.