* FTSEurofirst 300 up 0.3 pct, halts sharp 3-week retreat
* BNP Paribas's results help support banking stocks
* ECB keeps rates on hold; investors await press conference
* Euronext index data disrupted by technical problems
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By Blaise Robinson
PARIS, May 6 (Reuters) - European stocks were higher on Thursday afternoon, as BNP Paribas's <BNPP.PA> forecast-beating results helped the market halt a sharp sell-off sparked by escalating fears that the Greek debt crisis could spread.
Stocks slightly trimmed gains after the European Central Bank kept its main interest rate on hold at a record low of 1.0 percent, as economists had expected, while investors awaited the central bank's news conference due at 1230 GMT, to see what the bank will say on the euro zone's sovereign debt crisis.
At 1200 GMT, the FTSEurofirst 300 <
> index of top European shares was up 0.3 percent at 1,027.13 points in a roller-coaster session that saw the index falling by as much as 1.1 percent in early trade, before bouncing back.France's BNP Paribas, the euro zone's second-biggest bank after Spain's Santander <SAN.MC>, rose 2.2 percent after its strong results overshadowed the bank's 5 billion euro ($6.7 billion) exposure to Greece that the lender revealed on Thursday.
Germany's Commerzbank <CBKG.DE> also gained ground, up 4 percent after posting better-than-expected first-quarter results thanks to strong trading and lower risk provisions.
Europe's banking index <.SX7P> was flat. The sector is down 8.7 percent in 2010, Europe's biggest sector drop.
The FTSEurofirst 300 index has tumbled around 8 percent over the past three weeks and strongly underperformed U.S. stock indexes, beaten down by mounting worries over sovereign debt in the euro zone.
"Stocks have lost around 10 percent, and we could drop another 10 percent in the short term. The market will remain hectic until the billions promised to Greece materialise. But the (debt crisis) doesn't change anything for companies, whose results have been excellent," said Romain Boscher, chief investment officer at Groupama Asset Management in Paris.
The 110 billion euro ($147 billion) bailout of Greece unveiled over the weekend failed to allay concerns on whether the debt-stricken country can implement tough austerity measures and worries on the risk of the crisis spreading to other countries such as Spain and Portugal, whose credit ratings were downgraded last week.
Investors found some relief in macroeconomic data. German manufacturing orders rose by 5.0 percent on the month in March, official data showed, matching the most optimistic forecasts and completing a strong upturn in demand in the first quarter. [
]Around Europe, UK's FTSE 100 index <
> was flat and Germany's DAX index < > up 0.4 percent.Euronext said technical problems disrupted European index data transmission as well as data transmission on all shares on Lisbon's stock market, but said the problems would be resolved in a few minutes.
(Editing by Erica Billingham)