I suppose you are trying to deploy VSE 8.7 with patch 5 to these computers but also be sure to check the last extension available for VSE to support Windos 7 or you won't be able to manage this product on these computers.
If it still doesn't work just try to deploy McAfee Agent 4.5 with patch 3 on these computers (after checking its extension in ePO) and try to send a new wakeup call
you might be having the same symptoms as one of the guys here regarding a similar post. ePO database missing windows 7 platform code from tasks.
Please review KB67347 and KB67321.
thanks guys. i will try and let you all know.