VNC version for remote control (WIN7)

on a 500-PC campus network I need, often, to take the remote control of workstations to check what's users claims wrong.
Due to all PCs are mission critical, I'm looking for a light VNC version that can install autmatically from remote and do not interfere with logged user and his applications running.

Thank you
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Natty GregIn Theory (IT)Commented:
VNC enterprise
DarinTCHSenior CyberSecurity EngineerCommented:
i use Ultra

but Tight is probably the smallest footprint
or see article
Thin and guacamole are considered clienteles

heres another list i share

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DarinTCHSenior CyberSecurity EngineerCommented:
Question answered in full by darintch have
Recommend full points assigned to Darintch
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