Hello and welcome to Bleepingcomputer.
I do not know which operating system you originally had installed, so I am giving you a link for Windows Vista 32 Bit first.http://h10025.www1.hp.com/ewfrf/wc/softwar...t=3740339#N1286
This is Windows 7 32 Bit. http://h10025.www1.hp.com/ewfrf/wc/softwar...product=3740339
Please note you can change the OS yourself in the drop down menu provided on this page.
I suggest you try updating and flashing your BIOS chip using a DOS version of the flash utility.
This procedure has to be followed right to the rule, or you could render your computer un-bootable!!!
The procedure also involves entering the freshly flashed BIOS EEPROM set up to load fail safe defaults, failure to do this could prevent the computer from booting again.
Sometimes you have to use the CLR-CMOS jumpers which are found on the motherboard, the CMOS battery would have to be removed from its holder to prevent a possible shorting out of the battery.
If you truly wish to perform this BIOS chip EEPROM flash and need additional advice, please let us know, that information can be provided for you.