i have a HCL laptop with 2GB RAM and 500GB harddisk when i bought itmy laptop is very fast and work without any lag but then i formateed and installed window many times in my laptop after whic my laptop started laggging very much simple thing like opening word take lots of time and also when i start my laptop sometimes my keyboard does not work pls suggest me what can i do and should i switch to windows 10 in this confirguation or not plss help me ................................