Presence of Trojan Virus in Google Chrome Download?

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PLEASE READ ALL THE INFORMATION BELOW.
I have download this browser form Google and it is running properly. Not any "Avast warning"
There may be one reason for it that there may be a Trojan already present in your computer and when you are downloading google chrome the Trojan want to interact and effect your new browser because some of the Trojans could not be detected by anti virus because they do not harm your computer but they can steal your accounts and password like e-bay and other online shooping account.
But as your are using an anti virus which is daily updated..so when the Trojan tries effect your browser your anti virus detects it..
If you need any help about how to remove Trojan you can contact me!
Thanks.