Recently I ran into issues with various versions of Visual Studio 2010 release candidates / betas / rtm for Expression Blend 4. I accidentally installed the RTM version of Blend when I was still only using RC version of Visual Studio 2010. This led to all sorts of issues with Visual Studio 2010 RC, crashing unexpectedly, running low on virtual memory and not performing well, as well as just refusing to even start! Tracked this down to the version of the .Net framework 4 having been updated, and subsequently before every major install I put on my machine now, I create a restore point manually, so I know I can revert to this if things should start going pear shaped. (Note: this is the automatic behaviour when you install any Windows Installer Service (msi) based program).
To create a restore point, you can simply type “create a restore point” in the windows start menu, which takes you to this dialog, where you simply need to hit the create button.
To restore your system to a previous point in time (note: this doesn’t remove any documents that you created between the restore points), simply type “system restore” at the windows start menu,
choose a different restore point, and then select your manual restore point
