Freeze on startup Win64

Hey,

Apologies if this is the wrong thread.

I have installed the latest version. When i open all is fine, however as soon as i select anything e.g. rectangular tool it will freeze, i.e. cannot select any other buttons/drop down lists/close the program etc. I have un-installed and re-installed, removed preferences files.
I have downloaded to my laptop and it appears to work fine (wind 32), but failing on my desktop (win64).

If anyone has any suggestions as to why it crashes please share? Also any guides as to how i can provide more info to help diagnose?

Cheers
Tim

I am using the following;

OS Name Microsoft Windows 7 Professional
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name TIMPOATE-PC
System Manufacturer Viglen
System Model DQ67SW
System Type x64-based PC
Processor Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz, 3401 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date Intel Corp. SWQ6710H.86A.0054.2011.0815.1459, 15/08/2011
SMBIOS Version 2.6
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United Kingdom
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name TimPoate-PC\Tim Poate
Time Zone GMT Daylight Time
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 7.95 GB
Available Physical Memory 1.24 GB
Total Virtual Memory 15.9 GB
Available Virtual Memory 10.7 GB
Page File Space 7.95 GB
Page File C:\pagefile.sys