Hp pavilion dv5-1125nr ...I want xp but I can't do that

Try this AMD SATA ACHI (Sure it will work,,,I'm insured 100%)
http://www.4shared.com/file/244364514/141d8595/AMD_AHCI_Compatible_RAID_Drive.html
or
http://www.4shared.com/file/244365332/737959f5/32bit_ATI_SB7xx_RAIDAHCI_drive.html


I have the same prodect (dv5 1125nr AMD processor Turion X2, AMD chips and ATI VGA) and I succeed in downgrade vista and install win xp
first burn these small files in a floppy disc (press F6 in a starting of the blue installation screen when you use floppy)
http://www.datarecovery.com.sg/data_recovery/img/ra_reformat_2.gif

not: If you have 32bit windows xp cd version you have to choose AMD ACHI SATA controller X86
if you have 64bit windows xp cd version you have to choose AMD ACHI SATA controller X64

or if you haven't floppy desc dirive you can slipstream (integrate) SATA ACHI drivers into windows xp cd by lnite program (read more about, it just type it in google.com you'll get several topics).

note : in both case you have to make manual format (not quick format )
http://web.mit.edu/ist/products/winxp/advanced/reinstall01.gif

if you make NTFS quick format option you will get the blue screen screen with error
http://jmobley123.files.wordpress.com/2008/10/blue-screen-of-death1.jpg


Then you can get you drivers easly
http://www.general-search.com/download/driver-xp-dv5-1125nr

you will get all what you need about you drives

any other questions I'm at your services

my regards / Ahmed

Try scanning with this its very good
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?part=dl-10804572&subj=dl&tag=button