unity launcher greyed out.

i cannot run unity. since i upgraded from v4.x.x to v5.x.x laucher is just greyed out window: just a bar on top with lone red-x-close-button and grey. just grey. i managed to run editor by opening one of example projects directly back in v5.1.x but it does not work anymore in v5.3.x. even then, when it lauched, many windows in editor were greyed out just like launcher (ex. asset store). please help me.

fixed. kinda. it apperas that unity must be installed on thesame partition with your operating system. instaling it in default location fixed it for me.