Start -> Run -> gpedit.msc -> User Configuration -> Administrative Templates -> Windows Components -> Attachment Manager
Set Default risk level for file attachments to "Low Risk".
Set Inclusion List for low file types to ".exe;.vbs".
If the .exe or .vbs files are located on network drives, you'll have to set other options. Open Internet Explorer -> Tools -> Internet Options -> Security -> Local Intranet -> Sites -> Advanced -> Add the IP Address of the server which has the network share. Reboot your machine.
Hope this helps.