Your system is indeed badly infected.
The infection came from Bittorent, BitComet and IMesh
After analysys, I have found
1. Baidu spyware,
2. Pop Cap Adware,
3. Relevant Knowledge Spyware,
4. Rogue Trojan Horse
5. USB viral infection.
Yes your system is in a extremely sad state.
To answer your question, not only will these viruses slowdown your machine but it is vulnerable to intrusions. If you let them prosper, your system will blank out!
Also, I found:
a) 19 useless processes
b) 13 useless toolbars or Browser helper objects
Can you tell me about this software:
Dachshund Software-- C:\WINDOWS\Integrator.exe
And what about Freeze.com
Another very important question do you use any removal USB devices?
If you do, do not use them, they are probably infected and will recontaminate your system and may contaminate others.
No antivirus is perfect and in this instance, Avast was incapable of the detecting and removing all of those viruses, but I insist, you Ximxim have let them in through your torrent downloads.
Lets deal with the main infections first.
After you applied my medicinal compound, please run another ZHP log for me to look at.
I shall prescribe to you a very powerfull antidote that is able to kill and send any virus to the glue factory. It is of very last resort and should not be abused of, as matter of a fact, once you have used it, I suggest you delete it from your system.
To keep your system safe, you must follow the instructions hereunder to the letter:
First step, boot your system in safe mode with networking
1. Download Combofix to your desktop.
2.Close all open Windows including this one.
Close or disable all running Antivirus, Antispyware, and Firewall programs as they may interfere with the proper running of ComboFix.
3. Double click on the ComboFix icon.
Windows is issuing this prompt because ComboFix does not have a digital signature. This is perfectly normal and safe and you can click on the Run button to continue.
4. Accept the disclaimer and the recovery
5.You should now press the Yes button to continue. If at any time during the Recovery Console installation you receive a message stating that it failed to install, please allow ComboFix to continue with the scan of your computer.
ComboFix will disconnect your computer from the Internet, so do not be surprised or concerned if you receive any warnings stating that you are no longer on the Internet. When ComboFix has finished it will automatically restore your Internet connection.
While the program is scanning your computer, it will change your clock format, so do not be concerned when you see this happen. When ComboFix is finished it will restore your clock settings to their previous settings.
If you see your Windows desktop disappear, do not worry. This is normal and ComboFix will restore your desktop before it is finished. Eventually you will see a new screen that states the program is almost finished and telling you the programs log file, or report, will be located at C:\ComboFix.txt.
During the process, please do not mouse click nor must you tap on the keyboard. Let the tool run.
Once you are done, report to me on how your system is behaving and send the ZHP log.