Here is my top 10 list off apps to install on Windows 7, this is after a clean install or running a "decrapifier".
1 – Windows Security Essentials, need I say more, you need security, this is simple, effective and free: http://www.microsoft.com/SECURITY_ESSENTIALS/
2 – Live Mesh, sync files and folders between computers (PCs, Macs, Windows Mobile devices), remote access to your workstations, secure sharing with other people: https://www.mesh.com/welcome/default.aspx
3 – Windows Live, pick and choose what you want. I would highly recommend Mail, Writer, Photogallery and Office Live: http://download.live.com/
4 – Adobe Reader, there are still too many sites that have content in pdf format, make sure you don’t install the baggage that comes with reader: http://get.adobe.com/reader/otherversions/
5 – Adobe Flash, same as above, there are still too many sites that have content in Flash format: http://get.adobe.com/flashplayer/otherversions/
6 – Silverlight, just another tool you need in the toolbox: http://silverlight.net/getstarted/
7 – Office 2010 live (Skydrive), you can now securely save, share and edit Office documents in the cloud: http://skydrive.live.com/
8 – Photosynth, this is just cool, not just a photo but an immersive view of a location including geotagging: http://photosynth.net/
9 – Office 2007 document converter, if you have not yet upgraded to Office 2007: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=941b3470-3ae9-4aee-8f43-c6bb74cd1466
10 – iTunes, if you drank some Apple Koolaid and have and iPod/iTouch/iPhone, the same cavaets apply to make sure you don’t install some additional unintended crapware: http://www.apple.com/itunes/download/
If you didn’t drink the Apple Koolaid go for Bing 3D Maps: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=e9298080-50c4-4f2e-9fc4-4009074996ba
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