The IEEE 802.11 group was aware of this security problem and on June 2004 they approved an amendment in 802.11 – 11i. They add much stronger encryption, authentication, and key management tactics that guarantee data and system security.
If you want to use WPA2, you need a firmware upgrade (on an access point or wireless router) and driver update (on client adapter). So, as you can see, both client and wireless router (or access point) need to support WPA2. This updates you can find on vendors' web sites. Maybe you will need to upgrade OS too.