When I launch BOINC on Windows 7 64bit PC it is opening a completely blank grey screen.
Absoultely no buttons or tabs or anything at all
I have tried a repair - no luck
I uninstalled it, used CCleaner, re-booted re-installed and still it launches in blank screen
All other programmes and OS working normally and all patches up to date
I would welcome advice on how to fix please
Thanks
Emma

When you start BOINC Manager, could you check in Windows Task Manager->Processes if boinc.exe is running? If it isn't, then that could be the cause. BOINC consists of two main parts, the client (boinc.exe) which does all the scheduling and storing of data, and the Manager (boincmgr.exe) which allows you to control the client via a graphical user interface. If only BOINC Manager starts up, but the client doesn't, the Manager will be empty.

This can happen when something in Windows blocks the starting of the client. Think overactive anti-virus or other anti-malware programs.
Always exclude the BOINC Programs directory and Data directory from active scans by the anti-malware programs.

You can test if it's this, by doing Start->type boinc.exe in Search, click boinc.exe when it shows up. Check in Windows Task Manager->Processes that boinc.exe is running, and if it is, start BOINC Manager. Does that fix it?
If boinc.exe is still not running after you manually tried to start it, something is blocking it and you'll have to figure out what.

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Thank you very much indeed
It was, as you suggested, a malware programme that was causing problem!
All fixed and working now
Thanks for your help