Since this is the most asked question during my entire time in the PCM-community (7 years) it's definitely worthy of a thread for itself - stickied, so everyone can see it.
- First of all, uninstall the game via Windows Uninstallation Program or via the shortcut in the Start-menu.
- When that's done, go to your hard drive, find "Program Files" and see if there's any Cyanide-folder. If there is, delete it.
- Now, go to your My Documents-folder. Find the Pro Cycling Manager-folder and delete it.
- And here's the tricky part. There's also a folder inside a hidden Application Data-folder. If you're a Windows XP-user, go to Start and find Run. Type in %AppData% and the folder will open. Find the Pro Cycling Manager-folder and delete it.
If you're a Windows Vista-user, go to your hard drive, find "Users", your Computer Name. Inside this folder, you will find a folder called "AppData". If you can't see it it's because it's hidden. You will need to change some settings - go to Organize -> Folder and Search Options -> View -> Show hidden files and folders. You will now be able to see "AppData"
Open it and find "Roaming". Inside this folder, you will find the Pro Cycling Manager-folder you need to delete.
There you go. The game is now pretty much uninstalled. There's still some registry keys and probably some Starforce-stuff, but it should work. Install the game again, remember the latest patch and apply the DB pack of your choice.