TSM 6 for Windows is available as either a 32-bit or 64-bit client.
To determine what version you are using:
On Windows XP, right-click My Computer and select Properties.
Result: If you are using 64-bit, the text "x64 Edition" will appear after Windows XP Professional. If you are using 32-bit, it won't say anything after the word Professional.
On Windows 7 and Vista, right-click Computer from Windows Explorer and select Properties.
Result: In the System section, the System Type will say either "32-bit" or "64-bit" Operating System.