You only mention HP Officejet 5610 but there are different drivers for:
HP Officejet 5610
HP Officejet 5610v
HP Officejet 5610xi
Once you are looking at the exact version try "mdfix01.exe error" (without the quotes) as the "question or keyword" filter.
Since the HP drivers install via Windows Installer you might FIRST try the Windows Installer Cleanup utility.
Trying to install HP Officejet 5610 printer. Half way through a message of mdfix01.exe encountered a problem and must close.i have windows xp with service pack 2 ,i downloaded the drivers from hp wesite and installed it ,but no use mdfix01.exe error arises again,i read many reviews they it's microsoft problem, Any insight or remedies,help