Sorry, I don't think it is possible to id it from the pictures you've posted. Here are the things you should note in the future for this somewhat hard group:
1) Size (compared to other woodcreepers)
2) Bill colour and shape (long, short, heavy, gracile, straight, pointed etc.)
3) Extent of white (especially on head, lower belly and mantle) and type of colouring (streaked, spotted etc.).
4) General colouration (dark brown, warm rufous etc.). Many species have contrasting wings/tail and body
5) Habitat (primary/secondary rainforest, varzea, coastal dry forest, savanna etc.).
6) Where is it seen? Some species are almost always seen in the canopy, others prefer to be just a few meters above the ground (and many species are almost NEVER seen away from antswarms, i.e. Black-banded).
7) Voice is very good for id aswell. If you have a recording of the voice, they will often respond aggressively to play-back. Not usefull for id; but "pishing" also gives an aggressive responce in some of the species.
Finally, if I had to make the call from your photoes: It is one of the many members of Xiphorhynchus, most likely Straight-billed or Buff-throated (but may also be yet another species). I am not going to make a final call, as it would be nothing but guesswork.
**Added later: If people wonder how my guess on it perhaps being a Buff-throated Woodcreeper fits with what Jacamar describes as a "very white throat", it's because the population in Guyana belongs to the ssp. polystictus. They have white throats.