PROBLEM: Users unable to logon to W2k3 TS. There are 4 TS in a Citrix farm and once the problem happens the particular users can never logon. This issue is random and happens to only some users.
Error: Winlogon.exe - Instruction “0x75998902” Referenced memory at “0x0151036c”. The memory could not be “read“.
The issue was fixed by Resetting the browser settings by right-clicking on "User Configuration/Windows Settings/Internet explorer maintenance" in Group Policy.