On startup of game I receive this error
Tried using CCleaner to no avail.

Any suggestions?

==============================================================================
World of WarCraft: Retail Build (build 13287)

Exe: C:\World of Warcraft\WoW.exe
Time: Nov 17, 2010 6:39:09.696 PM
User: cubed2D
Computer: CUBED2D-FLABTOP
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This application has encountered a critical error:

ERROR #134 (0x85100086) Fatal Condition
Program: C:\World of Warcraft\WoW.exe

Failed to open archive Data/wow-update-oldworld-13154.MPQ. Missing or corrupted data.
Unable to recover using data from the network. Please check your Internet connection and try again.

Debug Details:

[0] err=4 text=Win32 Open - Data\wow-update-oldworld-13154.MPQ.writeCacheBackup
[7] err=0 text=Manifests::ReadDirectFile - ReadDirectFileFromBuffer failed
[6] err=0 text=ManifestInfo::ReadDirectFileFromBuffer - manifest_partial tag failed
[5] err=0 text=FileManifest::ReadIndirectFile - DownloadURL failed with no error
[4] err=0 text=Blizzard::Streaming::ManifestInfo::ReadIndirectFile - MD5 validation failed for http://ak.worldofwarcraft.com.edgesuite.net/wow-pod-retail/EU/12911.streaming/wow-13287-D066E0A6EF0BC4169EA7026EB4AF6079.mfil
[3] err=0 text=Blizzard::Streaming::ManifestInfo::ReadIndirectFile - MD5 validation failed for http://ak.worldofwarcraft.com.edgesuite.net/wow-pod-retail/EU/12911.streaming/wow-13287-D066E0A6EF0BC4169EA7026EB4AF6079.mfil
[2] err=0 text=Blizzard::Streaming::ManifestInfo::ReadIndirectFile - MD5 validation failed for http://ak.worldofwarcraft.com.edgesuite.net/wow-pod-retail/EU/12911.streaming/wow-13287-D066E0A6EF0BC4169EA7026EB4AF6079.mfil
[1] err=0 text=Blizzard::Streaming::ManifestInfo::ReadIndirectFile - MD5 validation failed for http://ak.worldofwarcraft.com.edgesuite.net/wow-pod-retail/EU/12911.streaming/wow-13287-D066E0A6EF0BC4169EA7026EB4AF6079.mfil
[0] err=0 text=Blizzard::Streaming::ManifestInfo::ReadIndirectFile - MD5 validation failed for http://ak.worldofwarcraft.com.edgesuite.net/wow-pod-retail/EU/12911.streaming/wow-13287-D066E0A6EF0BC4169EA7026EB4AF6079.mfil
Storm Error Msg:An attempt was made to move the file pointer before the beginning of the file.

You have some file corruption and it looks like the Repair on Demand can't fix it.

Please try running the Repair tool.

Are you all on proxy connections?