YATS32 will eliminate you problems with drifting and inaccurate system time. When just any old Internet time synchronizer won't do, take a look at YATS32. This application lets you accurately, automatically and reliably set your system clock using any of a number of time services available via the Internet or your corporate intranet. It supports multiple servers and time service protocols such as SNTP, TIME, and Unix Time.
I downloaded 5 different clocks and only this one allows me to set the interval between synchronizations at under an hour. Hallelujah! Not incredibly user-friendly, but I'm no big techie and I worked it out. God bless software that is not for dummies.