mpeg-1 layer 2 problem

[seblanders]

hi again!

after installing and uninstalling various codec packs for another problem, my pc seems to have a problem with mpeg-files, which are made with the mpeg-1 layer 2 audio-codec.

as far as understood the other posts about this codec, it is one of the most standard codecs around and usually is installed with windows. well, guess what: bsplayer provides me only with video, but leaves out the audio!

my questions are:
- how is it possible that this codec was deleted?
- how can i fix it?

my specifications are:
AMD XP 2000+ CPU
1024 MB DDR SD-RAM
Geforce 2 TI 64MB Videocard
I run BSPlayer 0.86 build 501

my video-codecs are:
cvid;Cinepak® Codec;1.10.0.6;Radius Inc.;
divf;DivX Video for Windows Codec;4
dmb1;M-JPEG V2;3
hfyu;Huffyuv lossless;4.51.16.03;No information available;
i420;Microsoft H.263 ICM Driver;4.4.3400;Microsoft Corporation;
iv31;Intel Indeo R3.1;4.4.3400;No company info;
iv32;Intel Indeo R3.2;4.4.3400;No company info;
iv40;Intel Indeo® Video 4.5;4.51.16.03;Intel Corporation;
iv41;Intel Indeo® Video 4.5;4.51.16.03;Intel Corporation;
iv50;Intel Indeo® video 5.10;R.5.10.15.2.55;Intel Corporation;
iyuv;Intel Indeo(R) Video YUV Codec;5.1.2600.0 (XPClientMicrosoft Corporation;Microsoft Corporation;
jpeg;Unknown;3
m261;Microsoft H.261 ICM Driver;4.4.3400;Microsoft Corporation;
m263;Microsoft H.263 ICM Driver;4.4.3400;Microsoft Corporation;
mrle;Microsoft RLE Compressor;5.1.2600.0 (xpclientMicrosoft Corporation;Microsoft Corporation;
msvc;Microsoft Video 1 Compressor;5.1.2600.0 (xpclientMicrosoft Corporation;Microsoft Corporation;
uyvy;Microsoft UYVY Video Decompressor;5.3.0000000.900 builMicrosoft Corporation;Microsoft Corporation;
vp31;On2_VP3;3
yuy2;Microsoft UYVY Video Decompressor;5.3.0000000.900 builMicrosoft Corporation;Microsoft Corporation;
yvu9;Toshiba Video Codec;5.1.2600.0 (XPClientMicrosoft Corporation;Microsoft Corporation;
yvyu;Microsoft UYVY Video Decompressor;5.3.0000000.900 builMicrosoft Corporation;Microsoft Corporation;

my audio-codecs are:
0x0001;PCM;4.0 .0;Microsoft IMA ADPCM;
0x0002;Microsoft ADPCM;4.0 .0;MS-ADPCM;
0x0006;CCITT A-Law;4.0 .0;Microsoft CCITT G.711;
0x0007;CCITT u-Law;4.0 .0;Microsoft CCITT G.711;
0x0011;IMA ADPCM;4.0 .0;Microsoft IMA ADPCM;
0x0022;DSP Group TrueSpeech(TM);1.0 .0;TrueSpeech(TM);
0x0031;GSM 6.10;4.0 .0;Microsoft GSM 6.10;
0x0042;Microsoft G.723.1;1.2 .1;Microsoft G.723.1;
0x0050;QDesign MPEG;1.1 .0;QDesign MPEG;
0x0055;MPEG Layer-3;1.9 .305;MPEG Layer-3 Codec ;
0x0055;MPEG Layer-3;1.0 .63;MPEG Layer-3 Codec ;
0x0055;Lame MP3;4.0 .0;LAME MP3;
0x0062;Voxware v1.1.6/1.1.8 File-Mode Codecs;4.0 .0;Voxware CODECs 1.5.0;
0x0069;Voxware v1.1.8 Bitstream-Mode Codecs;4.0 .0;Voxware CODECs 1.5.0;
0x0074;Voxware MetaVoice;4.0 .0;Voxware CODECs 1.5.0;
0x0075;Voxware MetaSound;4.0 .0;Voxware CODECs 1.5.0;
0x0130;ACELP.net;3.2 .0;ACELP.net;
0x0160;DivX ;-) WMA Audio 1;4.2 .0;DivX ;-) WMA Audio;
0x0161;DivX ;-) WMA Audio 2;4.2 .0;DivX ;-) WMA Audio;
0x0402;IAC2;2.5 .53;Indeo® audio software;