Photoshop CS4

[AND1SMIL]

have tried to get Photoshop CS4 to run but keep getting Photoshop has stopped working. In 64bit the error message is

Problem Event Name: BEX64
Application Name: Photoshop.exe
Application Version: 11.0.0.0
Application Timestamp: 48d38aa7
Fault Module Name: StackHash_a1a9
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Offset: 0000000000000000
Exception Code: c0000005
Exception Data: 0000000000000008
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 2057
Additional Information 1: a1a9
Additional Information 2: 97adcf723889235ddc4cb6cacaa74283
Additional Information 3: 8a4c
Additional Information 4: 9cfa5bc339a5d29061908def628328bc

in 32bit the error message is

Problem Event Name: APPCRASH
Application Name: Photoshop.exe
Application Version: 11.0.0.0
Application Timestamp: 48d3882e
Fault Module Name: StackHash_fd00
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 00000000
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 2057
Additional Information 1: fd00
Additional Information 2: ea6f5fe8924aaa756324d57f87834160
Additional Information 3: fd00
Additional Information 4: ea6f5fe8924aaa756324d57f87834160

I have uninstalled/reinstalled Photoshop and deleted the preference files to no avail.

I have installed Photoshop CS3 which seems to work except when I try to access the preference files when it crashes.

Can anyone help.

Thanks