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No need to really format the disk if you have the required space Windows 7 will install there, format it if you don't have anything there you need.
No need to really format the disk if you have the required space Windows 7 will install there, format it if you don't have anything there you need.
Back up your files. Boot from the Windows 7 CD. It will ask you if you want to do a clean install (I don't remember the exact wording, but you will know). It will then format your drive for you and install Win 7. It takes about 45 minutes and you need to stay by your PC as you will have to click on OK a few times. Things will go smooth. Good Luck.
Boot the WIn7 DVD, choose Custom install, then Drive Options to repartition if you want (Delete>Create), then Format the partitions before installing to first partition.
To get the cleanest possible install, I would delete all of the partitions including the useless Dell OEM partition since those Dell utilities will not work in a clean reinstall and it can interfere with Win7. The Recovery Partition can go if you have or have made your Recovery DIsks.
There are screenshots here: Clean Install Windows 7
The installer is mostly driver-complete, with newer arriving quickly via Optional Windows Updates. Any drivers then missing can be found in the Dell Support Downloads webpage for your model or a drivers disk if you have one.