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gcasDtServ.exe takes vast resources at the startup. Without it the startup may impove upto one minute on a W2k platform. Malware can be named anything so I recommend searching for the file on the HDD and seing where it is running from. GcasDtServ.exe should be placed in \System32 folder. It associated with MS Antispyware. MS claims it is an essential component of the their Antispyware server. Do not terminate the process, however, if it becomes a real nightmare, double check where the executable is runnig from.