I just had a look at the registry of my wee old XP machine and I found BOINC-references all over the machine.

But what'd be worth trying is creating a virtual drive F:, just to get you past this error-message and maybe provoking another one... Fire up Start->Run->cmd.exe and try:

C:\>mkdir test
C:\>subst f: test
C:\>f:
F:\>dir
 Volume in drive F is System
 Volume Serial Number is AC3F-3E9D

 Directory of F:\

13.09.2009  16:10    <DIR>          .
13.09.2009  16:10    <DIR>          ..
               0 File(s)              0 bytes
               2 Dir(s)   7.961.653.248 bytes free

Good luck...

Alex.

David, if Alex/Yalla's solution is not enough to let the installer start you might also try to use a USB key and set it as the F: drive.

If it does not mount as F: directly proceed as follows to change its drive letter:
Control Panel
- Administrative Tools
-- Computer management
--- Storage
---- Disk management
Then select the USB key in the displayed list, right click and select "Change drive letters and paths".

Good luck. Jean.