PNG error

[blaman]

While loading into servers, I get an odd error that pops up while loading datablocks. This error only occurs on some servers and it is really annoying. I dont know if its my laptop, an add-on they have or something else.
My laptop is running XP, not vista. My other two computers never got this error before running blockland. (Ones on vista, the other XP)
If anyone could help, It'd be much appreciated.

Thanks in advance.

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[1337fish]

Does it just crash or does it send you a message

[blaman]

An error pops up and It crashes.

[Headcrab Zombie]

Ok, what is the error?

[blaman]

Ill see if I can get a pic of it...
As it only happens on certian servers and I cant remember exactly what it said.
Right now I cant get on my laptop so its going to have to wait.