trojan virus infection

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Is there anyone who has encountered a problem whereby whenever you try to access your gmail,u keep getting a message that says that there is a problem with the websites security certificate,so you cannot sign in to your gmail or google account coz your computer just cant open the page,but strangely if you use another computer,no issues,not sure but there kud be some kind of virus or trojan infecting my computer which my anti virus cant resolve,i do a lot of surfing of Traffic exchanges which probably is where i got the infection from,be careful what your browser downloads,n then there is another very suspicious looking pop up now on my computer which is disguised like a windows program but when you try to close it it goes automatically to download mode,keeps telling me i have numerous viruses n must download a anti virus to remove it!