If you are on Windows Vista, please run the file as administrator.
Before you do that, lets start.
1. Download MSVCR90.dll and put the file in your %windir%\System32 folder. Skip to instruction number two if you already have the file.
2. Press Ctrl+R and put cmd in the text box and click the button OK. Run CMD as administrator if you are using Vista by typing this in the search box up of the start bar button: CMD. The results should show a cmd file. Right click it and click "Run As Administrator". Go to instruction number three now.
3. In the CMD, type this in: regsvr32 C:\Windows\System32\MSVCR90.dll.
4. The file should now register. The RegSvr32 popup should tell you that the dll has been successfully registered. Now, run the Crossfire hack, and run crossifre. Click Start on CrossFire, and press INS to open the menu.