My PC started working slower, took time to start up and open a new window or new tab. I suspected a virus. I ran Spybot and found my PC was infected with win32.agent.nmy trojan horse. I cleared it using Spybot, used CCleaner to clear my registry and defragment. I ran Spybot again and it was all clear, no more trojan horse. But it still takes time to start up and open a new tab, what should I do now?

Check Windows Add/Remove for Bad Programs

OK - I think that we should go through your computer and make sure that all the malware is gone, even though Spybot says it is. It’s worth checking thoroughly because some infectious code is cleverly programmed to evade your virus scans and hang out in your computer. First of all, you can use Windows Add/Remove Programs to look through all the programs that are installed on your system and make sure that there is nothing dangerous or suspicious. To open Add/Remove Programs just click Start, then choose Control Panel, and then Add/Remove Programs. Here is a link to a list of dangerous programs to look for, if any of them appear delete them. You should also delete your download of CCleaner, we’ll get the latest version later.

Remove Java and JSE - Java Sun Environment - Programs

While you are in Windows Add/Remove, delete any and all installations of Java or JSE. Old versions have weaknesses and should be removed. Then you can go to the Java website and reinstall the newest version when you are finished troubleshooting your PC.

Start XP and Vista in Normal Startup

You should also set your computer to start up in normal mode while you are cleaning your system. This is important and not doing so can lead to more complications. If you are running Windows 98, ME or XP:

1. Click Start, then Run, and then type msconfig and click OK
2. Choose the General tab, then choose Normal Startup
3. Click Apply, then OK then turn your computer off and on again

If you run Vista:

1. Click Start, then type RUN in the search box and then click Enter
2. In the Run box, type msconfig and click Enter
3. Choose General, then choose Normal Startup
4. Click Apply, then OK, then reboot your computer

Empty Trash and Quarantined Files

Now empty all your trash and quarantined files. This will reduce the amount of data on your system, simplifying the scans and making the process faster and less complicated. Empty your Windows Trash - right-click the icon and choose to delete the contents. Also, if you use a Norton virus scan, empty the quarantined files and the protected recycle bins.

At this point you can download and install CCleaner, but run it with only the default options enabled to get rid of your temporary files. If you have more than one user account on Windows, you need to run the cleaner on all of them.

Make All Extensions Visible

Before you continue, you should make all file extensions visible, so that your scans have the best chance of finding everything. If you run Vista:

1. Right click Start, then choose Explore, then Organize
2. Choose Folder and Search Options, then the View tab, then Show Hidden Files and Folders
3. Click to remove the check from Hide Extensions for Known File Types AND Hide Protected Operating System Files
4. Click Yes, then Apply, then OK

If you run XP:

1. Click Start, then Explore, then Tools, then Folder Options
2. Choose the View tab, then Show Hidden Files and Folders
3. Click to remove the check from Hide Extensions for Known File Types AND Hide Protected Operating System Files
4. Click Yes, then Apply, then OK

Follow Detailed Operating System Cleaning Instructions

Now use Windows Defender, which should already be on your system, or a reputable antivirus/antispyware program to scan your system one more time. Run a complete system scan. Sometimes, using a second anti-malware program catches malware that the first application did not catch.

Kate Dubensky | June 10th, 2009
Tags: antivirus, slow computer, virus, virus aftermath
Categories: Anti-Virus

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