Error -6002 when running Setup.exe

Hello!

While trying to run the Deus Ex:IW Setup.exe, i encountered this:

http://www.8ung.at/hardoverclock/pic...error-6002.gif

Installshield Error Code -6002. I already tried the other workarounds mentioned in this forum for the other installation errors, to no avail. I emptied my temp folders, removed the read only and hidden flags from \program files\common files\ and its subfolders, and i tried the msconfig way, disabling all auto-startup options. I closed all other applications and YES, i even DID check my internet connection, it perfectly works.

I'm logged into my box with the administrator account. Here are my system specs:

Hardware:
--
Asus P4C800 (with onboard sound enabled)
512MB Mushkin Level II DDR400
P4EE 3.2GHz
Asus GeForceFX 5950 Ultra

Software:
--
Windows XP Pro SP2
ForceWare 53.03
DirectX 9.0c

Any help would be greatly appreciated, thanks.