I have a PC with 1GB RAM and 128 MB of inbuilt graphics. All the 1080p videos used to work fine. But from past 2-3 weeks all the 1080p videos are playing choppy. I re-installed the OS and scanned for virus, no virus was found. I changed the "Skip H.264 in-loop deblocking filter" in VLC to "ALL", still the videos are choppy.