Another answer is to download the .rar and then reboot your PC in "Safe mode"(with networking)...AVG doesn't load on start-up...I am using Vista Sp1 and wasn't able to access the .exe file in normal mode but with what I learned on these forums was able to Flash/unlock sim (my first time) my w850i...Dont unpack the .rar until you are in Safe mode(with networking) and setool and Sim lock patch work fine...thanks again to this forum,saved me £££'s
BTW, dont use SEUS after or it will "upgrade" your firmware to CID53 and your fon will effectively be locked again