How can you tell if your computer has been hacked?
151059
It's pretty hard to notice if someone is hacking your computer. Those ebay scam emails appear to everyone, just ignore them.\nA good way to protect yourself from hackers is a firewall. Windows XP SP2 comes with one. To make sure it's on, go to Control Panel, and then check your Windows Firewall settings. If it's set to on, you're protected from most hacker attempts, but not all.
603319
i dont know but somebody might have hacked into your computer and got your password i recommend you to get another email address and tell everybody who emails you to email you to your new address  and also get any software that protects your computer and dont use the same password to prevent more hackers & viruses.
452737
1)Check the drop down menu on the explorer address bar.\n2)Check Explorer history.\n3)Check temporary net files\n4)Download a spyware programme and monitor his or her activities.
41269
You can turn on Auditing on your computer. Below is a useful link explaining how to do so.\n\nhttp://netsecurity.about.com/cs/tutorials/ht/ht040503.htm\n\nOnce enabled you can see the activity in your event log (right click mycomputer>manage>Event Viewer>Security.
1001317
you can go to symantec security check which scan you computer for viruses and it looks for the latest viruses on there list
158329
Scan for spyware with adaware and spybot\nhttp://www.jimmyr.com/security.php
214406
Put a keystroke logger on the computer such as XPCSPY and run it in the hidden mode and his password will be logged for you to see.Also allof his keystrokes will be logged.
70555
Sometimes there's no evidence at all.\n\nIf you know your computer's normal operation, sometimes you can detect abnormal disk activity or abnormally slow connection when you're online, but those could also be due to many other things.\n\nTo avoid having someone hack in to your computer, always:\n\n1. Have an anti-virus program installed, and keep the definitions up-to-date.\n\n2. Keep your operating system up-to-date with the latest fixes from the vendor (Microsoft for Windows, Apple for Macs, etc.)\n\n3. Install a software firewall such as ZoneAlarm. The one provided by default in Windows XP isn't always enough to protect you.
783895
If you are using a router it should have a log capability.  Log onto the router and check the log.\n\nIn addition the previous answer mentioned keyloggers and goggling.  However I suspect they would be detected by an antivirus.\n\nI would also suggest that you look for any thing spying on your machine.  Kids are pretty smart.
512036
How do you know you were intruded?\n\nDepending on what exploit the hacker used to gain access to your pc, there are some things you can do.\n\nfirst off, get all updates for Windows, Internet explorer as well as your anti virus program. \n\nthen clean up your pc of all the unused registry entries, temp folder files, and the rest. There is a program called system mechanic that does this for you. They offer a free fully functional trial that should help you restore your system. check them out here:\n\nIf none of this works...and your ready, you may need to reformat your hard drive meaning erase your whole computer and reload a fresh copy of Windows.\n\nif you want to go this way, also check out a mandriva Linux solution.
230786
I'm suspecting that either your computer is hacked or some virus is doing it. I remember an old virus was doing this several years ago.
6541
just use grep and search for suspicious activity
946081
Not unless you installed something.\nYou could for example do that with a local proxy server.\nBut if you just want to check. No there's no such log.\nIf you think it's full of spyware and viruses run a virus\nand spyware checker.
51531
Download AVG antivirus and run a full scan. free.grisoft.com\n\nAlternatively, you can type "msconfig" in the run command (start menu) and see what files are running at startup. Uncheck that executable file and restart your computer.
208611
That depends on their skill level.  If they have installed a keylogger that should be fairly easy to find, just about any anti-spyware application should be able to detect those.  Now, if they have somehow opened up a backdoor on the system, perhaps a firewall could tell you again, depending on how well the person has hidden it.  If you're really worried about this I like PreVx anti-intrusion software, it's like anti-spyware software but it also notifies you of system level changes like to the registry, configuration settings and the like so if someone is mucking around on the system it could probably tell you.  But it all depends on the skill of the person who is potentially spying on the system.\n\nI'd say run every spyware scanner you can think of (Adaware, Spybot, Windows Defender, Spyware Blaster) then get a Firewall (I like Sygate Personal myself) and for intrusion detection I have yet to find anything better than PreVx, http://www.download.com/Prevx-Home/3000-8022_4-10364927.html?tag=lst-0-1\n\nIf there's a keylogger on the system, the spyware scanners should find them and if someone has made changes to the system PreVx should detect that.  Also, check msconfig and the Task Manager for suspicious processes (usually just a Google search can identify them).\n\nOf course to use any of this stuff you will need admin permissions on the PC.  Since it is a school it is very likely that they are keeping track of websites visited and I would bet almost anything that they are blocking MySpace at the very least.  Of course, if they have routers they are probably configured to track and log everything as well so there may not be anything on the individual computers at all.
1025338
You can put a keylogger on the computer and see everything that was done on it including any passwords that were entered.\n\nGo here for information - http://www.download.com/3120-20_4-0.html?tg=dl-20&qt=keylogger&tag=srch
277124
If you are truly talking about the windows "Net Send" command the computer of origin is part of the message and message box.  You could then find that computer and possibly find out who was signed on at the time.