Enterprise Vault Cannot Open this item - Copy or Move it to your Mailbox

Hello

Recently I've been hearing back from some users (not all) with fresh Windows 7 Installation, Outlook 2010 x86, Enterprise vault 9.0.1 HTTP / Enterprise vault 10.0.1 clients that they keep getting below error when trying to open archived items from their Inbox/other folders

http://sdrv.ms/RCDQ0S

When trying to run ResetEVClient.exe, it fails to re-register lot of DLLs. The EV icons themselves appear as shown below:

http://sdrv.ms/SQhps3

I couldn't find anything in client logs either. The EV Server version is 9.0.1 with 10.0.1 client hotfix applied. Attached are client log with Level 3 tracing. I couldn't use ctrl+shift to get to them, so had to use registry to get maximum tracing.

OWA works fine, so the EV shortcut itself is good. Re-installing Outlook 2010 and creating new profile didn't help either.

I am out of ideas, can use some help here please. Thanks in advance !