How can I remove the bundle of trojan viruses under tdssmqlt.sys from my PC?

The version of windows used on the PC is Windows XP Home Edition. The viruses prevent me from downloading software from the internet that has to do with removing viruses. I transferred many antivirus software programs from another computer to the infected PC. So far I tried most of the free antivirus/anti-malware software available: AVG, A-Squared, avast!, Ad-Aware, Avira, and Spyware Doctor. Some of the antivirus programs failed to work because the viruses stopped them from accessing the internet to get updated. Other antivirus programs, Ad-Aware by Lavasoft and AVIRA, recognized the viruses and allowed me to click the delete on, but a message came up that the viruses can only be deleted by restarting the computer. After restarting the computer, the viruses were still there. I scanned the PC with Avira, and after scanning for hidden malware, it showed me the names of the bundled trojans located in C:\windows\system32\drivers\tdssmqlt.sys… Some of the trojans in the bundle are TR/Agent.439, TR/Crypt.ZPACK.Gen, and TR/Rootkit.Gen to name three out of about six trojans shown by Avira. The trojan viruses are also hidden. I tried searching my PC in the location in the C drive to delete them, and I was unable to locate them. Now, what should I do to get rid of the trojan viruses after all of my failed attempts at removing them?