We have a mixture of dual core PC's , mostly 2 GB RAM but some 4 GB. Processors are around 2 to 3 Ghz. Mostly Viglen genie ultra small PC's. Usual school software - office, sophos, impero, some photoshop (on 4GB machines). Microsoft site say our spec is OK but suppliers say only i3 or higher processors would give acceptable performance. Machines are about 8 years old and budget is very limited. So grateful for any comments to upgrade or replace.