Try using the "clean" command in Diskpart. It can't hurt and might help.
I assume this laptop has only a single drive. If by chance it has 2 drives, disconnect the drive that is not the target of the install.
What exactly are "slim drivers
If it remains slow after the next install, let us know what is going on with processes and CPU cycles per Resource Monitor.
Is that a single 2 GB stick of RAM, or a pair?