We use cookies to provide you with a better experience. If you continue to use this site, we'll assume you're happy with this. Alternatively, click here to find out how to manage these cookies

hide cookie message
2,862 Tutorials

How to reinstall Windows 7 as an upgrade or a custom installation

What to consider when reinstalling Windows 7

Are you intending to reinstall Windows to speed up your PC or laptop? Our Helproom Editor offers tips on how to reinstall Windows 7 as either an upgrade, or a custom installation.

QUESTION Three years ago I bought an HP laptop running Vista with a free upgrade to Windows 7. The upgrade consisted of two discs: HP Upgrade Manager, which I had to run first, and a Windows 7 disc, marked 'For use only as an upgrade to a qualifying HP Windows 7 Upgrade PC'. The Windows disc has a valid Microsoft product key sticker. My overloaded laptop is now grindingly slow and it's time to reformat the hard drive and reinstall the OS.

Can I do this in the same way as the original upgrade, or will the fact Vista no longer exists on the computer cause problems? Anon

HELPROOM ANSWER Before starting this procedure, it's vital that you've backed up everything you need from your system. The Windows 7 upgrade disc should consider an existing installation of Windows 7 a valid operating system from which to 'upgrade'. Don't reformat your hard drive before you start. Instead, insert the Windows 7 upgrade disc and run the installation from Windows.

You can choose to complete either an upgrade or a custom installation. The upgrade option will perform what used to be known as a repair installation, leaving your programs and settings intact, but returning the operating system to its original state. You'll need to reinstall any Windows updates and drivers following the installation.

However, a custom installation won't clear out the bloat from the Registry. We'd advise opting for the custom installation. This will leave you with a fresh version of Windows, without your documents and applications, but with your previous installation backed up in a 'Windows.old' folder from which you can recover that data.

You may run into trouble if you wipe your hard drive before you begin the procedure. The upgrade key is unlikely to activate your installation if a valid upgrade hasn't taken place. There are workarounds for this, such as installing Windows 7 twice or employing a Registry hack to fool the system into thinking it's a valid upgrade. However, we recommend avoiding this; while no problems have been reported so far, it's feasible that Microsoft might flag up such activations as invalid in the future.

The HP Upgrade Manager disc contains versions of HP's preinstalled software that were previously compatible only with Vista. It's designed to manage the upgrade process for you. It may be wise to start by running this disc first as HP may have customised the installation discs, making them slightly different in operation from the standard Windows installation media.

See all How to articles. Get free tech support in the Helproom Forum.

Visit Windows 7 Advisor for more Windows advice. Or email our Helproom Editor for bespoke advice.

IDG UK Sites

Nexus 6 vs Samsung Galaxy Note 4 comparison: What's the best Android phablet?

IDG UK Sites

The iPhone is doomed. Doomed to be marginally less successful than a very successful thing.

IDG UK Sites

How to prototype native mobile apps without writing code

IDG UK Sites

How to prepare for and update to OS X Yosemite: Get your Mac ready to download & install Apple's...