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In Task Manager
- click file
- click New Task(Run...)
- type the following line into the open: field
cmd
- click ok
From the prompt type
copy C:\WINDOWS\ServicePackFiles\i386\explorer.exe C:\windows\explorer.exe
Hit enter.
There is a space after copy and a space after i386\explorer.exe
You should recieve a 1 file(s) copied message
Type exit and hit enter.
In Task Manager
- click file
- click New Task(Run...)
- type the following line into the open:
explorer.exe
- click ok
Click your start button, right click My Computer and click properites
- click the hardware tab
- click Device manager
Brilliant work on your behalf! 
No yellow marks on the hardware and ostensibly it's all working. I haven't connected to the net yet, I feel that I should run some anti-malware first. I have AVGfree, Zone Alarm and Malwarebytes - these are (of course) not up-to-date.
What can you suggest, bearing in mind that they didn't seem to fix the original problem - and what do you think this was??
Cheers, Alan
