First, upgrade to IE7 :
http://www.microsoft.com/windows/downlo ... _id=20510b
Next you will need IE7Pro which is also free and allows running of imitations of Greasemonkey scripts but on IE7:
Note: IE7Pro Scripts are NOT the same as Greasemonkey Scripts
Now you need to set it up for running scripts.
In In Internet Explorer go to Tools->IE7Pro Preferences
You will see this:
Click on User Scripts in the left hand list.
You will see this
Make sure the Enable User Scripts checkbox is checked as above.
You're now ready to install and run scripts.
The first time you install a script , you will need to press "Reload All Scripts" in the above picture.
You will need to check the new scripts checkbox. Here is an example for Conquer Club Map Rank:
IE7Pro is relatively new and not as field tested as Greasemonkey so there are some lingering bugs which are being fixed.