It probably is a bug, mostly found when using IE7. I'll bet you don't use IE6.
Some options:
-Disable IE plugins. I've a dutch version of IE, so this is my guess where you can find the options: Extra / Options / Advanced / locate the item 'browser extensions' and disable them.
-Reïnstall internet explorer 7 or go back to 6 (rollback, via system restore point or a ghost-image. Ghost is a nice program to backup your Windows system now and then).
-Run http://windowsupdate.microsoft.com/
-Use FireFox2 (http://www.mozilla.com/en-US/firefox/) or Opera9.1 (http://www.opera.com). On some computes Opera might use 99% CPU on some websites.
-If you want less errors in general: use Apple of Linux. However, there are few Linux-games (compared with Windows).
General advice, which might help:
-Don't install toolbars and IE plugins, unless you absolutely need them.
-Wait with installing new versions (in this case, IE7 in stead of IE6) until they have functions you really need or want.
-Now and then, clean temporary files and histories.
-Now and then, run http://www.pandasoftware.com/activescan to check for malware.
-Do not store documents, mp3's, mail, pictures, etc. on the same (C:)drive where you installed Windows. Then it's easier to backup your own created stuff, and it's easier to backup (Ghost) the Windows-drive (C:-drive). Two harddisks in your PC is a good way to create such a system. (Two partitions is an option too, but two harddisks give more safety; if one harddisk crashes, you can use the backups which you create now and then on the other harddisk). Example: First harddisk = C: & D:, second harddisk is E:; with C:=windows, D:=backup of docs which are on E:, E: also has Ghost-backups of C: Then, before installing programs or updates or new drivers, it's always a good idea to make a ghost-backup of your C:-drive.
-Run the rootkit revealer now and then: http://www.microsoft.com/technet/sysinternals/securityutilities.mspx
-Try installing the newest video card drivers.
Some might advice you to check the memory (like with memtest86). Bad memory is not likely the cause in this case: generally, bad memory causes different errors at different times, often already at starting Windows.