Why I cannot install Win7 to my XP?

You can not upgrade for XP to Windows 7.
It needs to be a clean or "Custom" installation coming from XP.

Some More Info about upgrading from XP -> Windows 7: http://windows.microsoft.com/en-us/w...p-to-windows-7



If the upgrade advisor shows everything should be OK...

My advice would be to backup all the files you want to keep to a secondary HD, or whatever means your comfortable with.
Since a custom installation will wipe the drive.

Do not worry about programs. You will be better off re-installing these. Also, many may have a newer version for Windows 7.
Just worryabout your personal DATA such as Pictures, Music, Videos,Documents etc ...



Win7 should do fine with locating & installing all the drivers you need.
But as a precaution, it wouldnt hurt to download and save a copy of drivers for all your hardware to flash drive, or CD.

Once youve backed up everything you want to keep, boot from the DVD and do a clean installation of Windows 7.

Hello schwalbe17, welcome to Seven Forums!



To go along with what Wishmaster has said, it would be best to do a complete wipe of the Hard Disk Drive / Solid State Drive and then start the installation process again, have a look at Step One of the Optimize tutorial below; after you have copied out or made back-ups of the data you need to save to external media, then boot the Windows 7 installation media to do the wipe secure erase to the HDD / SSD and be sure to post back with any further questions you may have and to keep us informed.

Whether you use diskpart to run either the clean all command to completely wipe a HDD / SSD or just the clean command to remove the format configuration data and don't use diskpart to create at least a single partition to do the installation to, letting the Windows installer do the format you will end up with the new Windows 7 System Reserved partition, if you want to make your own decision whether this partition is added, study these two (2) options below.

• Then if you do not want to create the new Windows 7 "System Reserved" partition use the outline in Step Two #2 to create, format and mark Active a single 100GB partition to do the installation to.
• If you do want to create the "System Reserved" partition use the outline in Step Two #3 to create, format and mark Active the System Reserved partition and then create and format the 100GB partition to do the installation to.

Either way, running the "clean all" then creating and formatting the partition(s) using diskpart will get you the best possible space to do a clean install of Windows 7 to; you can always extend the Windows partition to include the remaining unallocated space on the HDD / SSD or create additional Primary partitions or an Extended partition after the installation completes if you choose.

SSD / HDD : Optimize for Windows Reinstallation

DISKPART : At PC Startup

Do a Clean Install with a Upgrade Windows 7 Version