Find the temporary folder where the Basecamp update is stored. On Win7 it’ll be C:\Users[youraccountname]\AppData\Local\Temp\Garmin Software Updates

Delete everything inside Garmin Software Updates folder, then right-click on this folder, choose Properties, then **Security **and finally click Edit.

For all user groups in the list check Deny box in Full Control row below. Then Apply, Yes, OK, OK. That worked for me.