Guild Wars 2

As the title says, been having this error since i last patched. I also did updates on my windows xp aswell, as this might have caused the problem.

Anyways, this is the error i have been getting:

—> Crash <—
Assertion: hdr->signature == PACKFILE_SIGNATURE
File: ..\..\..\Services\Packfile\Packfile.cpp(1821)
App: Gw2.exe
Pid: 3876
Cmdline:
BaseAddr: 00400000
ProgramId: 101
Build: 18906
When: 2013-05-30T08:18:35Z 2013-05-30T16:18:35+08:00
Uptime: 0 days 0:00:23
Flags: 0

If anyone can help or suggest what to do. Hope i don’t have to re download everything again coz it takes forever to do that. Thanks in advance guys and gals.

This error keeps on popping up when i try to launch the game, anyone else having this problem or have a fix for this? Thanks in advance.

• Crash <—*
  Assertion: hdr→signature == PACKFILE_SIGNATURE
  File: ..\..\..\Services\Packfile\Packfile.cpp(1821)
  App: Gw2.exe
  Pid: 2044
  Cmdline:
  BaseAddr: 00400000
  ProgramId: 101
  Build: 18906
  When: 2013-05-30T06:39:55Z 2013-05-30T14:39:55+08:00
  Uptime: 0 days 0:01:44
  Flags: 0