morksig: Thanks Sickboy for posting this! Another way (if you have an Nvidia card), is to use NvidiaInspector -> Driver profile settings (icon next to "Driver version"), select the Giants profile and set "frame rate limiter" to whatever your monitor does, e.g. 60fps. Tools for AMD cards like RadeonPro might do something similar.
This worked perfect, at first i thought this was going to be a hassle and almost didn't bother (troubleshooting game issues is becoming tiresome these days). Anyway I just had to play Giants again so here I am letting people know that using Nvidia Inspector is actually hassle free and worked great for me (I have a 75hz monitor so I just matched the framerate).
Thanks very much! :)
*Edit* I'd also recommend downloading the latest (unofficial) 1.5 patch as it has nice graphical improvements and some bug fixes.