I use the stand alone version btw. winscp404.exe
When i use winscp i use multiple instances to tranfer files to a server. the thing is that theese tranfers is verry long several days for all data. But whenever winspc runs my systems get many kinds if strange behaviours like programs take forever to install or klicking on a link in msn or irc takes serveral minutes before it opens. when winscp is not running tha same operations proceeds instantly. That makes me conclude that winscp is serverly hinder my systems regualr operation when run.