Divesting these assets would help Dell bolster its balance sheet after it agreed in October to buy data storage company EMC Corp The three private equity firms are vying for Dell's Quest Software, which helps with information technology management, as well as SonicWall, an e-mail encryption and data security provider, the people said this week. on the sale of IT services company Perot Systems, which could be valued at between $5 billion and $6 billion, the people said.