Chances are it is UAC (User account control). try right clicking and running as administrator, if that doesn't work goto security center, turn off UAC, install, then turn UAC back on (if you want it on).
good luck
P.S. When you exit sa-mp you need to use the windows task manager to end the samp.exe process, it happens no matter what.
good luck
P.S. When you exit sa-mp you need to use the windows task manager to end the samp.exe process, it happens no matter what.
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