32bit browsers stopped working 64bit fine ???

I am Having problems after doing a full clean install of windows 7 64 bit on my pc about two weeks ago I was pleased to see that everything seemed to be working well but over time the nagging faults have started to creep in it has started to restart itself just after the log in screen and also to randomly freeze and last night my 32 bit browser programs stopped working Internet explorer 32bit firefox and msn messenger all say that a internet connection is not availiable however the 64 bit version of internet explorer is working fine and is able to connect to the internet without any problems
please help
all these programs were working perfectly for about two weeks untill yesterday and I have done nothing to change any thing when I turned it off everything was working fine when I turned it back on the next morning different story.

System Info;
Mainboard : Gigabyte GA-73PVM-S2
Ram: 4 GB
OS: Windows 7 64bit
Graphics: ATI Radeon HD 3850
Sound: Creative Sound Blaster X-Fi

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