HD woes

I have MS-6161 MB with 500Mhz Celeron, 128Mb RAM, and pri 2.1GB and sec 10GB. problem is pri is really Fujitsu MPD3043AT ie 4.3 GB HDD. Autoexec had pointer to Hdsize.txt file that recognised the 4.3GB drive but in the next line said it was a 2.1GB PRI DOS FAT16 drive, although I run FAT convertoe to FAT32 OK. Renamed the autoexec file - still no success, went into bios and forced it to recognise the 4.3GB - still not working - what gives?? Any solutions to this problem will be appreciated.

Cheers

Mike