My intellisense in Sql Server Management Studio (SSMS) stopped working months ago and I finally decided to get it back.
Turns out that installing VS2010 R1 disables intellisense in SSMS. Who knew?
The solution? Install the cumulative update 7 for SqlServer2008.
1. Go to here and select "SQLServer2008R2_RTM_CU7_2507770_10_50_1777_x64" if you are running the 64-bit version (it's fifth from the bottom). Download it. Well, you can't just download it. Frustratingly, you have to enter your email address and then they email you the link.
<grip text="Why can't microsoft just have a menu option in SSMS under "Help" for "Update to latest patches" - even Quicken does that." />
2. Click on it to execute it and wait. Wait some more. Then realize, it's not going to run the installer it just unzips it to a directory.
3. Go to that directory and run "SQLServer2008R2-KB2507770-x64.exe" and that will install the update.
4. Although it doesn't encourage you to do it, reboot your system.
Worked for me.