* 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