* Investors buy on breaks, igniting late-session rally
* Strong sentiment could boost prices early next week (Recasts, updates comments, closing prices, market activity, changes dateline from LONDON)
* Disappointing Dell results drag down Wall Street
* Oil settles under $77 barrel on dollar rise, equity slip
* Strong dollar, weak stock markets pressure oil
* Increase in floating storage shields weak demand
* Investors fret about the recovery, curb riskier bets
* Weak results from Dell, D.R. Horton weigh
* Wall St dragged lower after disappointing Dell results
* Oil falls under $77 barrel on dollar rise, equity slide