I have a Compaq Pressario I am trying to update from Win Xp Home (oem) with a retail Win Xp Pro. I have not been able to do so -from what I have narrowed down to be my CD/DVD rom. It is not, (I do not believe) the original CD/DVD rom that came with the computer when I purchased it 13 months ago. I have had to reinstall the original factory disks twice now, to get me back to a good starting point. When I do this, the system does not recognize my CD/DVD drive. However, with changing the jumpers I can get it to recognize the drive (therefore enabling it to read the drive and attempt to set up Xp Pro). The problem then becomes, I get an error message during the copying of XP Pro files, that due to internal configuration it cannot install. I have a SATA drive, and a CD/DVD rom set to CS. The first thing the HP support "gang" tells me - before letting me complete my description of my problem is that they do not reccommend upgrading because of the drivers. They have said this twice, leaving me to believe (not) I have purchased a computer that will never be able too grow with my needs! They quickly change the story after they question the validity of my purchased MS XP Pro cd (upgrade), asking if I "received" a copy of MS XP Pro. I didn't "receive" anything - I PURCHASED it! As if the MS God's have dropped a goodie bag of software on my doorstep. My questions are- 1) If this is infact not the CD/DVD rom that came with the computer, but has been working, do I need different drivers? 2) Should I have the cd/dvd rom set to CS, on the first IDE controller? I had an extra hard drive set up I was using for storage, but am not even going to think about attaching that again at this point. I have just reinstalled with factory disks, and will be at a good starting point again. But am still sitting here with a $200 receipt for a CD I am not able to install and a headache from trying to understand the HP support "staff" past the initial "Thank you for calling HP.............." intro. Any help or suggestions is very much appreciated as this "alterted machine" was my ex husbands and I have no idea what he did with it. Thanks!