I am so glad that someone else has had this problem - and has found a way of resolving this. I looked in vain for ages, until finally finding a little utility called DrTCP, which makes chaging verious TCP setting easy without getting into the registry.

I am currently having issues with a dialup connection using an aironet GPRS modem card which although it should attain approx 117kbps seems to be slower than using and old 9600kbps GSM card under windows 95.  I am hoping this may be a similar problem but i have yet to resolve this.

Anyone know of a fix?  
Clintski2@aol.com