Roblox client refuses to load after the first time it runs

On my laptop which uses Windows 7, games will only load and run once, and then refuse to load again until I restart my laptop. When I try to play, the loading popup appears, but the loading text doesn’t appear and the amount of program memory doesn’t increase. I have tried reinstalling Roblox, but it didn’t help. I also tried switching browsers, but it didn’t help. Roblox Studio still loads just fine though. The browser I use is Chrome, and I tried launching a game with Internet Explorer, but it didn’t work on that either. Could it be a caching issue?