MYBOOKLIVE

MYBOOKLIVE (a storage device hooked to my network) is blocked by Avast. how can I view it in windows explorer without disabling avast

do you have avast with firewall?

Setting up Firewall Application Rules in Avast Antivirus
https://support.avast.com/en-eu/article/Antivirus-Firewall-Application-Rules

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NOTE:The Network profiles control the settings which determine how strictly Firewall protects your PC.

Private: a lower level of security suitable for when your PC is connected to a trusted network such as your home or work network.
This profile enables better connectivity, and permits all communication within the network.

Public: a higher level of security suitable for when your PC is connected to a public network such as in a cafe or airport.
Because public networks present greater security risks, no incoming communication is permitted when this profile is set.

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Also see info posted here by @BWith
https://forum.avast.com/index.php?topic=227130.msg1505540#msg1505540

How is it being blocked, e.g. are you getting a message or alert (a screenshot may help) ?