I need urgent help!

I'm not able to upload any files. When it reaches 100% it stops and gives me an unknown error, only that!

detail:

in the target folder of files they are named with the following standard:

"uploading.59aed08b-750b-20d1-e9fa-5257f041d0c9.sample.doc"

i'm waiting one return,

Clovis Amaral