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Hi All,
Thank you both for taking the time to reply.
VHG - yes I do have two hdd's. One of them is a 100Gb solid state drive so doesn't take up much room. The other is a standard sized 1Tb.
Buenchico - I thought for a few seconds about what VHG said and decided that if it all went wrong then I'd just have to re-instal W7 which isn't a drama these days so I delved into my registry...I found that I had two 'C:\Program Files' entries...so changed them both to E:. I uninstalled the problematic progs on the C: (Google Earth and Epsom Printer stuff) and reinstalled the Epsom - that came up on the on the E: ok. Google, however, has reinstalled itself on the C: and placed a directory on my E: to look out for the 'Crash Reports'. So that's a 50% success anyway.
Thank you both again for taking the time to reply.