The 2 included in zip file should solve problems with this cd-writer not working properly in windows xp. Use the readme file first and follow the directions. They worked great for me.
They are both .sys files, but all you need to do is copy them into your drivers folder and allow them to overwrite the current version of the files and then reboot.
The following files are found inside the driver download file.
|HpCd-Writer9900j(ci)drivers/cdralw2k.sys||22.3 KB||29 Jul 2001|
|HpCd-Writer9900j(ci)drivers/ReadMe1st.txt||776 bytes||16 Aug 2003|
|HpCd-Writer9900j(ci)drivers/cdr4_2K.sys||52.5 KB||29 Jul 2001|