Firefox & Windows 7 x64 Service Pack 1

[#1]

I thought I was doing well with my new Windows 7 (x64) computer until it decided to update to Service Pack 1.
It refused to install and I went all around the houses trying all the things that windows suggested, checking out all the error messages, to no avail.
Suddenly I was aware of an almost subliminal flash of a message that Firefox was incompatible.
I exported all my bookmarks to Internet Explorer 9 and removed Firefox and lo and behold, Service Pack 1 installed like a lamb.
With my spelling abilities I needed a spell check and stumbled across Speckie which seems to do the job well.
Has anyone else had this problem with Firefox which I understand is a 32 bit application.
Oldgeezer.

[#2]

None whatsoever

[#3]

Browsing this page using Firefox 5 running on Win 7 64 bit Professional SP1.  No problems.

[#4]

Firefox 5 and Windows 7 64 bit Home Premium SP1 and no problems.
And I did have Firefox installed when I installed SP1.

[#5]

Just tried to re-install Firefox 5 and Windows tells me non-compatible software.
I know when I'm beat. 
oldgeezer.

[#6]

Switched PC on this afternoon and Windows reported it was repairing it'self. Eventually it finished and I tried re-installing Firefox 5.  It installed and runs without problems now. All's well that ends well.
oldgeezer