Hi. Your English is fine.
You have partly answered your own question: "no matter in what sneaky way they ask that".
Means: be a bit careful what you click on.
There are many security procedures/measures/ways that you can help secure your computer. Most of the antivirus vendors have free virus removal tools available, sometimes good for just a few difficult viruses. Here is an example. (It's a part of Avast, anyway, so no need to download it.) Here are some more. With this sort of tool, you have to have an idea what the infection is. These can certainly help clean an infected computer.
It is better, of course, to prevent infection. Avast has worked well for me, other users seem equally happy with AVG or Avira. Both are free.
Running the browser from a user account rather than an admin account can reduce damage. If you use Firefox, get the "Noscript" extension.
Using an immunizing application, like SpywareBlaster (by Javacool), or MVPS hosts file, can prevent damage from known bad sites. They won't load in your browser.
Use a good firewall. There are a few good free ones around.
Consider using an antispyware program. I use SpywareTerminator. It has an optional process "blocker" called "HIPS". (These can be very effective, but you have to learn how to use them.)
You can also use a demand scanner to check your computer every week or so. Good (free) ones include Superantispyware, AVG antispyware, Asquared.
There is a free antitrojan application that is very popular with some, called Boclean, by Comodo. It isn't a scanner, but claims to stop trojans that are identified running. I've tried it, no major problems.
Don't go overboard with too many running processes. (More = less, sometimes.) Only have one resident antivirus, only one firewall, and one realtime antispyware. If you try to install more than one of each, you will have problems. You can have as many demand scanners as you want. 2 or 3 is usually adequate.