It will reformat the partition the operating system is on. You can reformat other partitions (if there are any and you want to) from within Windows (as you can now before reinstalling).
If you do a clean install make sure to use the "advanced" drive options at the start of the installation process as that allows you to format the partition first. Its in small print on the screen and not obvious if you are not familiar with it.
My Computer
At a glance
Windows 7 Professional x64Intel Core i5 2430M (2.4GHz)4096Mb 1333Mhz DDR3 SDRAMIntel Integrated HD
- Computer type
- Laptop
- Computer Manufacturer/Model Number
- Dell
- OS
- Windows 7 Professional x64
- CPU
- Intel Core i5 2430M (2.4GHz)
- Memory
- 4096Mb 1333Mhz DDR3 SDRAM
- Graphics Card(s)
- Intel Integrated HD
- Monitor(s) Displays
- 17.3 Inch HD Anti Glare
- Screen Resolution
- 1600 x 900
- Hard Drives
- 320Gb 7200rpm serial ATA
- Keyboard
- Illuminated standard
- Mouse
- Microsoft 3500
- Internet Speed
- 40Mb
- Antivirus
- Security Essentials
- Browser
- IE11 x64
