Explorer Crashing All the Time

AppName: explorer.exe AppVer: 6.0.2900.5512 ModName: kernel32.dll
ModVer: 5.1.2600.5512 Offset: 00012aeb

XP SP3

For the past few days out of the blue, Explorer will crash when copying files or even just highlighting them. SP3 was done weeks ago with many reboots and file copying since. Nothing has been changed on this computer.

Any info on this? Too little info?