This child forum "SlickEdit User Macros" is for custom macros posted by users.
This post belongs in the parent forum "SlickEdit".
The first thing to check is whether the key bindings for Ctrl+Dot and/or Ctrl+Comma have been modified.
The Ctrl+Dot and Ctrl+Comma keys have worked fine for me on WinXP, WinVista, Win2003, Win2008, and Windows 7 (and 2008 R2).
Also, check if those key combinations can be recognized by other applications on the laptop -- it could be possible that the laptop keyboard might be wired such that those keys lock each other out, making those specific key combinations impossible to be detected by the hardware.