By Greg Roumeliotis (Reuters) – HelpSystems LLC is exploring a sale that could value the information technology management software company at more than $700 million, including debt, just two years after it changed private equity ownership, according to people familiar with the matter. Private equity firm Summit Partners, which bought HelpSystems in 2012 from another buyout firm, Audax Group Inc, has hired boutique investment bank Harris Williams & Co to run a sale process, the people said this week. …