Install Y Browser on your phone, your phone should allow it as it's signed (it was at the time of this posting)
YBrowser website in case security certificate is outdated
Connect Your phone using data transfer mode and copy the other 2 files (installer.exe and CProfDriver_SISX.ldd) to a directory somewhere on the phone (remember where!) I copied mine to E:\Hack
STEP 4: - READ CAREFULLY!!!
Open up Y-Browser
Hit the menu key (so Y-Browser is still running in the background)
Run HelloCarbide from your applications folder.
Click options >> Menu1
--it will say Done....probably
Then click Yes
Go back to Y-Browser
Copy the 2 files mentioned in Step 3 to C:\SYS\BIN
Note: If you accidently exit Y-Browser before you have copied the files, you will have to turn your phone off and back on and repeat step 4
Once the 2 files are in the SYS\BIN folder, you can turn your phone off and back on and Voila! You will now be able to install unsigned apps like RotateMe etc