Well, I have tried to install 1.20 many times and with different ways. Disabling DMA for HDs en CD-ROM, disabling 4x on my VIA Chipset, changing my RAM Clock speed from 133 mhz to 100 mhz, replacing my CD-ROM, my CD-ReWriter, etc.
I played OFP 1.30 a long time ago  but now, I can´t, I don´t know why. Just a moment ago, I have just installed OFP and upgraded to 1.20 in my old K6 2 500 and it worked perfectly!. I always have the error in DTA/Sound.pbo.
My PC is:
-AMD K7 Duron 700
-Motherboard ASUS A7V133 VIA KT-133A with BIOS 1006/FXD.
-256 MB RAM 133 MHZ
-nVIDIA AOpen GeForce 2 Ti 64 MB DDR
-CD-ROM LG 52x.
-CDRW AOpen CRW2040 20x10x40x.
-Two HDs Seagate 20 GB 7200 RPM UDMA100
-Sound Blaster 128 PCI.
-Windows XP Pro.
Please help ´cause I wanna play OFP the sooner the better
 Thank u very much everybody.