Typical symptoms of an infected computer are:
1 - Slow computer: Your computer is so slow and seems to be doing a lot of background work,
2 - When you try to install or run some applications, especially security software, they always fail and give errors
3 - While browsing you see different search pages, toolbars or some pages especially those of security software vendors do not seem to work,
4 - You security software continuously report a threat but cant clean it,
These symptoms are not the only symptoms that you may be observing. Sometimes, there can be no symptoms at all.
Under any circumstances, you need to make sure your computer is not infested or even if it is, it can be cleaned properly.
In order to do so, you should use free COMODO Cleaning Essentials:
1 - Download COMODO Cleaning Essentials from one of the links below:
2 - Run a Smart Scan or a Full Scan and follow the directions shown(Press and hold SHIFT key while running CCE.exe to force it to run in aggressive mode)
3 - After steps 1 & 2, if there are any infections, they will be cleaned. However if you are still having problesm, then you should run Tools->Killswitch to see what is going on in your computer.
Killswitch is going to let you see all the activity from processes with their ratings to autorun entries. It allows you to disregard anything safe and provides a good basis for you to get help from this forum.
We will be continuously updating this post for more tips.
Edit: I updated the download links. Eric