A Windows 7 VM is a security risk if connected to the internet. This prevents many legacy worm exploits.
Most "Windows 7 slow on KVM" problems trace back to emulated IDE/SATA drives. To hit the leaderboard, you must use VirtIO-blk or VirtIO-scsi . windows 7 qcow2 top
Once the driver is loaded, the qcow2 disk will appear, and you can proceed with the installation. 3. Usage in Specific Platforms : A Windows 7 VM is a security risk