Have you ever had problems when logging on to an database with SQL Server Manager. The manager is slow. Almost frozen. There is a little bit strange solution to this problem. 

Open Internet Explorer. Go to Internet Options -> Security and uncheck 'Check for publishers certificate revocation'. Viola...That´s it :) 

Have you ever got that annoying "Access Denied" when using Gacutils  to ad an dll to GAC? Well....I have. The reason to my problem was that (as the error says) I had no access to add dll:s into it. I am administrator on my machine, so I think it´s a little bit confusing.

This command did it for me:

CACLS c:\WINDOWS\assembly /e /t /p [DOMAIN|MACHINENAME]\useraccount:F

CACLS is an application that can display or modify the Access Control List (ACLs) of files.

So, what I´m telling my OS (Windows XP) is that my user (machinename\useraccount) should have full rights (the :F after my user) to the WINDOWS\assembly (GAC) folder. /e tells CACLS that I want to edit ACL instead of replacing it. /t tells it that those changes should be applied to this folder and it´s subfolders. /p tells the application that my users access rights should be replaced. 

For more info, type CACLS /? in CMD.

FYI: In Vista CACLS is deprecated. Use Icacls instead.