Why google is suspecting me?

Very often google asks me to verify humanity by CAPTCHA when I try to search something on google.
Why google is suspecting me so much?
Is it due to any virus or adware or spyware?

 

when does it ask you to enter the code while searching ? or somewhere else

 

Maybe your IP address or class is so unfortunate, that they qualified it as source of spam queries.

 

When searching. Normally I use FireFox's search box in the toolbar.

 

it may depend on what you are searching for. If you are searching for a phrase similar to phrases used by spyware it might flag you.

 

Your PC infected by adware/spyware
Your IP sent too many query to G

 

Are you using automated rank checking or other seo tools?

 

Seo Quake firefox extension is installed. It reports PR and some other information for each google search result. Do you think that it is creating the problem?

 

Doesn't that have some sort of spyware installed with it?

 

I don't think so because it is listed on mozilla site >> https://addons.mozilla.org/en-US/firefox/addon/3036

 

it might be sand boxed?

 

Sometimes give this warn me too.

 

i encountered this problem when i tried to used proxy, or using browser agent plugin for firefox.

 

Sorry, I don't understand this term. Will you please explain?

 

Sandboxed is when a site is temporarily experiencing low ranking in the first few months.

Ignore his post though, He obviously didn't read the thread. Sandboxing has nothing to do with what you are experiencing.

 

Yes this is the problem, only turn it on when actually looking to compare information, otherwise for "normal" searches turn it off.

 

Suspicion is humanly nature...maybe google AI is getting human these days?

 

google the word sand box and you will see all the info their"

 

Thanks eli03!!
I guess I have got the right answer. I was also using a proxy. When I bypass the proxy, I don't encounter the problem. It seems google has blacklisted the proxy IP.