Here are a collection of tips for getting SSRS 2008 R2 working under Windows 7 on a simple setup like a single user laptop. I have had to go through this a couple times and were a few things that tripped me up so I thought I would try to pull all the solutions into one post in case it helps someone save some time. If you are getting the error message…
“User ‘someDomain\someUser’ does not have required permissions. Verify that sufficient permissions have been granted and Windows User Account Control (UAC) restrictions have been addressed.”
…when trying to open Report manager there is a good chance the following may help.
This approach is the easiest and is only appropriate for a single user laptop or developer kind of set up. If you need UAC then go figure out how UAC is supposed to be configured and make that work for you. This way just makes it work by putting your user account into the security role SSRS needs to avoid the UAC conflict.
First you need to run your browser as Administrator. This the first place you can get tripped up. The “Run as…” option is used (accessed with a right of the mouse if you didn’t know) but don’t try to do this on the IE icon in the Taskbar. Open Explorer and navigate to the the folder that has iexplore.exe executable and do it there. Now you will actually be running IE as the Admin account you select from the dialog that pops up.
If you have done the above correctly you should be able to successfully navigate to your new SSRS Reports folder. The default URL would typically be http://localhost:80/Reports. If you used a name instead of “localhost” then it might be http://lenovo-t60p:80/Reports for example. The 80 port is the default and obviously you need to change that if you used a different port. The main point is that if you installed 2008 R2 and SSRS correctly, then configured SSRS correctly and are running IE as Admin you should get to a page that looks something like the following. If you are still getting the original error that brought you here it is time to think about starting the installation over and checking for any missed steps. Is the Report service is running? Can you see the databases created by the SSRS configuration tool in SSMS?

Once you have gotten the screen above the rest is easy in my opinion. All that remains is to add your user account to the Admin roles in two places under SSRS and then you will be able to run IE from your normal user account.
So, while still running IE as Admin, navigate to the Site Settings, click on Security, then New Role Assignment and add your account to the list. After adding myself to the role list my setup looks like the screen shot below.

Now, we need to do this in one more place. We need to add our account to the Home folder security role list. Navigate back to the default start screen which is the Home folder and click on Folder Settings. Then using New Role Assignment add your account to the list.

If there is nothing else wrong with your SSRS configuration you should be good to go. Exit IE and start IE again using your normal account to see if you can access the SSRS service URL now.
The only other issue I had was not having http://localhost/ (or in my case http://lenovo-t60p/) in the list of Trusted sites in IE’s security settings. To do this you will have to uncheck the check box that restricts entries to https only.

Good luck with your new SSRS 2008 R2 installation. The tool is looking better than ever!
[Edit] – One more thing I ran into on an early attempt. I was using AVG Free 9.x anti virus software. It was interfering with SSRS so I removed it. I probably could have tweaked it to exclude some folders or whatever but I didn’t have the time for that so I tried Lavasoft’s Ad-Aware and have had no problems with it right out of the box.