I'm trying to upgrade an HP Pavillion a6720y from Vista Home Premium 64 to Windows 7 Home Premium 64 via the official HP upgrade disc I ordered a few years ago. Each time it tries to boot into Win7 for the first time it fails on the file "JRAID.SYS". I have 3 internal drives on SATA1 (boot) and SATA2 (data) and a DVD-ROM on SATA3 and an external USB drive, interface in BIOS is (and was) set to RAID (though they're not mirrired or striped, just separate drives). I found a newer version of JRAID.SYS and installed it, but now it fails on "JGOGO.SYS" (says file is missing or corrupt). My current version of Vista is using the identical version of JGOGO.SYS that Win7 installls and says is corrupt.
I was finally able to get the HP Windows 7 Upgrade disc to work. For anyone else with this problem here's how I did it:
The issue with the JRAID.SYS & JGOGO.SYS files is because my HP desktop came with the BIOS set to RAID under SATA interface. Although I added more hard disks I didn't use an array (JBOD) so I needed to change the SATA interface from RAID to AHCI.
Unfortunately if you just try changing the BIOS setting to AHCI neither Windows Setup nor Vista will boot, it will just hang, so leave the BIOS set to RAID or if you tried changing it reboot and change it back to RAID.
Now reboot into your old OS (Vista), and open a DOS box (cmd window). Then enter the following commands exactly:
Now reboot and choose Windows Setup as your OS. The Windows 7 upgrade should now continue ok.
However, I then ran into the following problem: Windows 7 Setup cannot find the image.wim file even though, after rebooting back into Vista, the file appears to be there and identical to the copy on the upgrade DVD. The issue seems to be that some optical DVD drives don't transfer huge files correctly (the image.wim file is 3.7GB!) even though they don't give any error messages. If you get this error do the following:
Google wintoflash.com and download the free app.
Use it to image the Windows 7 Upgrade DVD to a USB flash drive (must be at least 4GB or larger). Remove any files from the flash drive first as it will be reformatted. Now just run setup.exe from the flash drive instead of from the DVD. The Windows 7 upgrade install should now proceed without error.
Hope this helps (took me several days of web searching to figure all this out!)
Forgot to add, I also had issues with getting Windows 7 to update for the first time. The updates (over 130 of them) would proceed for a while then seem to hang for hours. I downloaded the Windows 7 SP1 from Microsoft (make sure you choose the right version, 32 or 64 bit) and installed it first. It takes a while to install but it eventually finished ok. I then rebooted and installed the necessary Windows Updates in groups of five or six instead of all at once. Don't know if I needed to do that but they all eventually installed ok.