Hi all,Sorry if i ask this question to this forum,during upgrade to ATI catalyst 8.07 , i have message that driver was not digitally sign by windows but i continue to install it, finally the middle flying with 737-700 PMDG suddently my system suddently stop and i try to restart it, also cannot. i have to restart using safe mode that enable me to restore my system back.i successfully restore my PC and get warning that my previous ATI 4.9 also not digitally sign, as i know during first installation of this driver i didn't receive this warning.how to solve this problem, any harmful if we use the ATI driver which not digitally sign by window ?System Win XP home edition,Powercolor Radeon 9600XT

"ATI catalyst 8.07" ??????????Afaik, 4.9 are latest official drivers.My advice, go into safe mode, use Driver Cleaner 2 to get rid of all files, reboot normal, install official 4.9 and reboot.You *should* be OK.

Hi all,YES, you can go to Guru3d , ATI catalyst 8.07 beta test.where i can download Driver cleanner 2 ?

>YES, you can go to Guru3d , ATI catalyst 8.07 beta test.Beta versions, as not official versions, can't obtain MS certification and are thereby not digitally signed.Furthermore, hacked drivers often are not digitally signed too (or shouldn't be).