LtFlufflez

Inside the original mod folder,  they have the TEST FILES folder. Click into that. In there is the "BACKUP TEST FILES". Install all the backup files. If you are too lazy to do that, just copy the update folder, x64 folder, common.rpf, and all of the x64.a-x64w and paste them into your mods folder. This will basically resets almost all mods besides plugins and callouts. So it's almost like a fresh install.

Done! I can drive a huge police cars. Thanks. 

Ha no problem. Glad to help. 
 
I don't know why it would cause an issue. Yeah it's old but the sheriff2 issue seemed to just randomly start. I did a whole redo of my mods folder like three weeks ago and all of a sudden boom no good. No mods changed or anything I just started fresh. Weird. So glad it wasn't just me though!

Please run the diagnostics tool, and post the results. Thanks

Try uninstalling LCPDFR (All files associated with it in the Scripts folder) And re install the mod by running the installer as ADMIN, Other wise, It will not work, Also, just to clear this up, Alt + T puts the Tazer on your holster, Alt + T again pulls it out, none of these will work if you don't run the installer/game as admin....

Did you enable show taser on belt in the Lcpdfr settings in the Gta iv directory>scripts>lcpdfr>setting doc, after that change the setting Show taser on belt to True. Btw the default setting is false.
Edit: Please stop bad Repping me, for a constructive post

Sigh, I wish the moderators would dis-able reputation for me, all im trying to do is help others.

Just to check, did you also make all your game's folders not "read-only?" You can do this by right-clicking on the folder "Grand Theft Auto IV" and then unchecking the "Read-only" setting next to the heading "Attributes." If you do this and run the installer as an administrator (right-click on the installer and select "Run as Administrator," in addition to being logged on with an admin account) then it should work out fine, as it does for everyone else.