low res mouse?

[streetgang]

Hi all have a problem with a couple of games, firstly elemental, I know who hasn't? but mine is that unless I ctrl/alt/delete and then cancel, the mouse wont go to the bottom of the screen and stops about an inch above, also in stalker clear sky once I set everything up to max, which should be fine for my system, the mouse wont move out of a small box in the top left corner of the main menu screen, any suggestions gratefully accepted, I'm using a fully up to date version of win 7 home premium 64 bit and the games are all patched up

[streetgang]

Ok it seems to have something to do with anti aliasing, all seems well with it turned off, I have an XFX Radeon 5570 slightly over clocked via the catalyst overclock utility, there are four modes of anti aliasing in the control centre, Box, Narrow tent, Wide tent and Edge detect then there's multi sample, adaptive multi sample and super sample, has anyone had similar problems or know the best settings to use? I just want to get the best out of my games, maybe it's a direct x11 compatability problem?