I see no way for a user from our website to gain access to your computer. Passing PMs back and forth will not divulge any information necessary to hack into your computer or IP.
What is more likely to be a source of access to your computer is visiting unknown sites or opening/clicking on e-mail or websites that allows implantation of a virus, trojan, worm or other executable program. This may have occurred PRIOR to your interaction with another GT.ru user. They can sit in your computer and become activated later, depending on what type of intrusion tool was utilized.
Do you use anti-viral/anti-intrusion program to protect you from these more common sources of intrusion. If not, install one and run it through your system, it may identify the source of intrusion that you refer to as having been hacked.