Optimising speed of Clinic Office 2005 & Deleting Update

Two questions:

Optimising Speed of Clinic Office 2005

Any tips for optimising the speed of Clinic Office 2005? I have found it great but it seems to be running a lot more slowly than Clinic Office XP. My computer appears to be really “labouring” to run the programme.

Deleting Update Files?

When I download an update file and run it, can I then delete the executable file that I downloaded or do I have to leave it saved on the computer? Do I have to keep the original executable file on the computer as well (first version of Clinic Office 2005 I downloaded)?

Thanks
Claire