Not had any problems up until this point. I changed some settings on services earlier, and then I noticed this problem: whenever I try to open a 3D game, the program will freeze. I have opened 3D programs like Blender3D and Quick3D fine, but games don't work. Assuming it was these settings, I did a system restore to just before I changed the settings (luckily the restore point had been made during a windows update, I think). I ran system restore to this point, but that didn't work.
In a minute I will run system restore to an earlier point (if it's fairly recent), and see if that solves it. However, I reopened the "Services" and "Features" settings programs in Windows, which reported that the settings were reverted, but the problem remained.
Also, when I open MSN Messenger (standard msnmessenger.exe), it won't open. I double click on it, it starts to open, then randomly stops completely, without reporting any errors. I need urgent help with this problem!
CPU: Intel Quad-Core (4 processors) at 2.50Ghz (each)
RAM: 4GB DDRD
GPU: nVidia GeForce GT240 512Mb
OS: Windows 7 Home-Premium 64-bit edition
Thanks for your time :)