you can goto>> win+r >> services.msc>> in services you have to start the services of volume shadow copy select it start and also start system restore service.
yes you can change the processor to Intel® Core™ i3
Intel® Core™ i5
Intel® Pentium®
Intel® Celeron®
as it is configurable option by lenovo.
but it is good that if you are technically strong then only can to do this work.