I have an Intel Core i3 530 based PC that is dual-booted with Windows XP SP3 and Windows 7 Ultimate 64-bit. While watching videos in fullscreen in Media Player Classic, the video becomes very sluggish on right clicking to access the right-context menu. This problem occurs only in Windows XP but not in Windows 7. The problem continues from the previous version of K-Lite Mega Codec Pack that I have installed to the current version I am using, i.e. K-Lite Codec Pack 6.2.0 Mega. What could be the reason - Intel graphics or the software itself? Please help.