wireless mouse keyboard prob

[folken]

I just got the cordless freedom optical mouse and keyboard set from logitech and it is behaveing oddly. When I'm playing games (counter-strike, quake, unreal tournament)there seems to be a noticable amount of time between when I click the mouse and the gun fires. Also when I try to hit more than 1 button at a time the thing won't do the second command. like in counterstrike, if I'm walking(holding shift) and go to crouch(hit ctrl) I won't crouch until I release shift and then hit crtl. It only happens some times but it really makes me mad when it does happen. I have fresh batteries in both the mouse and keybord and the reciever is only about 1ft away from both. I got them very cheap ($57) and they seem to be used or refubished. The s/n on both the mouse and keyboard are covered in black pen so I assumed they are refubs.
should I send them back or is there something I could do?
any help would be welcome!
thanks

comp stats if applicable:
pIII 800
512mb PC133
20gb 5400rpm
nVidia Riva TNT2 m64 pro
mini atx pos mobo
mouse/keyboard plugged in via PS/2 ports

 

[jihiggs]

those are typical complaints of wireless mice and some cheaper keyboards. its just the nature of wireless.

how do you shoot the devil in the back? what happens if you miss? -verbal