I've this. Very close of your computer unles that my graphic card is a 5700 and your a 5770.
Second Life 3.1.0 (243176) Oct 16 2011 12:16:07 (Second Life Release)
[ReleaseNotes]
CPU : Intel® Core i7 CPU 860 @ 2.80GHz (2808.75 MHz)
Mémoire : 8184 Mo
Version OS : Microsoft Windows 7 64-bit Service Pack 1 (Build 7601)
Distributeur de cartes graphiques : ATI Technologies Inc.
Cartes graphiques : ATI Radeon HD 5700 Series
Version Windows Graphics Driver : 8.17.0010.1094
Version OpenGL : 4.1.11079 Compatibility Profile Context
Version libcurl : libcurl/7.21.1 OpenSSL/0.9.8q zlib/1.2.5 c-ares/1.7.1
Version J2C Decoder : KDU v6.4.1
Version Audio Driver : FMOD version 3.750000
Version Qt Webkit : 4.7.1 (version number hard-coded)
Version serveur vocal : Pas connecté(e)
Compilé avec MSVC version 1600
Paquets perdus : 0/999 (0,0%)
Meanwhile, I'vve just noticed that the beta version has any problem ! I will use it.
Thank for your help.