Try to find the culprit of the conflict by selectively boot your system. First try only ZA and Windows services and then slowly put back the unchecked items (first services and then startup items).
1.) Click Start -> Run
2.) Type MSConfig in the run box (or search box in VISTA/Win7) and click OK (ENTER in VISTA/Win7)
3.) Once in MSConfig, click the Startup Tab
4.) Remove the checks from everything except ZLClient
5.) Click the Services Tab
6.) Place a check in "Hide All Microsoft Services"
7.) Now remove checks from everything other than TrueVector Internet
Monitor and ForceField (if present), and click OK.
8.) Restart your computer
How does it work Now?
NOTE: You can place your computer back into a normal startup process by
going back into msconfig and choosing the Normal Startup option on the