windscreen wipers keep tangling ?

Wrong wiper blades fitted, or wrong fitting kit used.
On some cars the driver and passenger side blades are different lengths and/or are fitted differently, but as you have not bothered to tell us make/year model of car we cannot give further advice.

admin
February 2011

Wiper arms may have moved on the splines and need resetting.
OR
Linkage might be worn
OR
Blades are incorrect size for vehicle

Maurice
February 2011