B737-400 HAD COMPLETED DEICING AND WAS PROCEEDING TO RWY 6. TXWY LIGHTS OBSCURED BY SNOW AND TXWY DIFFICULT TO SEE. THOUGHT WAS OFF TXWY AND CGP CHKED ACFT FOR DAMAGE. OK TO CONTINUE AND TWR ISSUED CLRNC TO PROCEED TO RWY 6.

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THE ARPT CONDITIONS AT BDL ARPT WERE RPTED AS RAMP AND TXWYS COVERED WITH UP TO 4 INCHES OF SNOW. IT WAS ALMOST IMPOSSIBLE TO DISTINGUISH BTWN RAMP AREAS; TXWYS; AND ADJACENT AREAS. AFTER BOARDING WE TAXIED TO THE DEICE SPOT AND WE DEICED AS PER OUR COLD WX OPS MANUAL. THE SURROUNDING AREA WAS COMPACTED SNOW WITH SMALL SNOW BANKS ALL AROUND; OBSCURING ALL MARKINGS AND THE MAJORITY OF LIGHTS; AGAIN MAKING IT ALMOST IMPOSSIBLE TO DISTINGUISH BTWN TXWY RAMPS AND ADJACENT AREAS. ALSO; IT WAS STILL SNOWING RESULTING IN REDUCED VISIBILITY. WE INITIATED A SLOW TAXIING OF THE ACFT FROM THE DEICE SPOT AND WERE HEADED SW TOWARD THE END OF RWY 6. AFTER A FEW SECONDS OF TAXIING; WE STOPPED THE ACFT AS NEITHER MYSELF NOR THE CAPT COULD ASCERTAIN THAT WE WERE ON THE CTR OF INTENDED TXWY. THE GND CTLR CONTACTED US AND ASKED TO HOLD OUR POS. SOON AFTER; COMPANY PERSONNEL APCHED THE ACFT AND TRIED TO COMMUNICATE WITH THEIR HEADSET; WE COULDN'T ESTABLISH COMS BECAUSE THEIR HEADSET WAS MALFUNCTIONING. APPARENTLY WE WERE STOPPED IN THE IMMEDIATE AREA NW OF TXWY C (SEE ATTACHED DIAGRAM). WE ASKED THE CTLR IF HE WANTED US TO CONTINUE TAXIING AND HE GAVE US THE AUTH TO DO SO. THE CAPT; LOOKING OUT HIS SIDE WINDOW; SAW THAT COMPANY PERSONNEL WERE INSPECTING THE ACFT AND FOLLOWING THAT A COMPANY PERSON MARSHALLED US TOWARDS THE CTR OF THE TXWY GAVE US 'THUMBS UP' AND WE CONTINUED TAXIING WITHOUT ANY DIFFICULTIES.