"an error occurred while opening the file dialog"

Hey Rluevanos,

I suggest you to check in a new user account and see if the issue is resolved or not. 

To create a new user profile:

To create a new profile, you must first create a new user account. When the account is created, a profile will also be created.
 
1.  Open User Accounts by clicking the Start button, clicking Control Panel, clicking User Accounts and Family Safety (or clicking User Accounts, if you are connected to a network domain), and then clicking User Accounts.
 
2.  Click Manage another account.  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
 
3.  Click Create a new account.
 
4.  Type the name you want to give the user account, click an account type, and then click Create Account.
If it works fine in new account, then your current account might be corrupted.

 
To fix a corrupt account, please follow the steps in the below link:

http://windows.microsoft.com/en-US/Windows7/Fix-a-corrupted-user-profile

If this doesn’t help,  let’s run SFC scan to find missing or corrupt files that may be causing this issue.

System File Checker (SFC) checks that all Windows 7 system files are where they should be as they were by default and not corrupted, changed, or damaged.

1. Click Start, click All Programs, click Accessories, right-click Command Prompt, and  select Run as Administrator.

2. Click Continue or supply Administrator credentials if prompted. 

3. In the Command Prompt window type the following, and press Enter:

   sfc /scannow

4. You should see the following on-screen message:

    Beginning the system scan. This process will take some time.

    Beginning verification phase of system scan.

    Verification % complete. 

5. Once the scan has completed, test to see whether the issue that you are experiencing is resolved or not.  

Refer the KB article for more information:

http://support.microsoft.com/kb/929833

 Regards,

Savan – Microsoft Support.