deep trouble with lime wire pro

[maanu]

im using lime wire pro 4 3 months n it was running quite nice bt now perhaps it get conected at tourbo charge connection bt download speed ll no more than 3k/sec.my os is win xp with sp2 and with 512mb of ram..im usin lime wire pro 4.9.23(also tried 4.9.37 pro)..im using lan 4 my net connection...plz help me.and one most importent thing z dat i also tried frost wire4.9.37 beta and it run very good on my system(its download speed)bt it takes much time to connect...i m also usin zone alarm pro...with 80gb of hd