Wall Street share prices fell back in early trade as poor results from Microsoft dragged tech stocks downwards.
The Dow Jones fell 51.62 points (0.57%) to 9,017.67 shortly after opening.
Microsoft saw its shares plunge 10.25% to $22.94 after revealing profits fell by a third in the second quarter.
The results had a knock-on effect for other technology firms, with Intel shares down 2.31%, while United Technologies fell 2.27%.
American Express shares fell 3.94% to $28.29 as the firm revealed revenues fell by 18%.
Johnson & Johnson shares climbed after the firm settled a patent infringement case relating to birth control pills. Generic drug maker Teva will have to pay the firm an undisclosed sum.
In London, the FTSE 100 continued to hit fresh 2009 highs thanks largely to tech stocks.
Shortly after 3.30pm, the index was up almost 17 points, or 0.36%, to 4,576, although it had hit 4,602 earlier on Friday.
3i Group advanced the most, gaining 9.5p, or 3.75%, to 262.5p, while Vodafone rose 3.55p to 120.45p.
Lonmin, Standard Chartered and the London Stock Exchange Group also gained.
Notable losses included a 23p hit to 467.25p for Pennon Group and a 14p slump to 312.25p for Compass Group. Friends Provident Group fell 2.29p to 69.6p.
Staying invested could prove lucrative
Consider lasting powers of attorney
Less environment, more governance threatens to undermine firms' green credentials
Evidence your compliance