I recently is having the same issue after i downloaded some stupid l4d update with viruses in it, which dumps virus files in my temp and IE temp folder, my bet is u're having viruses problem as well, u can try these steps:
1)ctrl-alt delete after log in windows, go to -file-new task-type explorer, tat shud gv back ur windows
2)to solve it, go to safe mode, manually delete temporary internet files and temps dun worry.,...i won't kill ur comp...but u can backup it if u wan...but considering viruses in it
3) from ms-config, disable all startup except thoses needed such as antivirus...etc
4) run a clean scan using ur av program as well as spybo search and destroy(must in safe mode!!)
5) if tat aint fixing it, hook up ur harddisk to anonther comp as secondary and run a scan( ask technichian if dun hv spare comp)
6) last choice, backup ur important file using ur comp or another comp into harddisk or dvd, reformat and reinstall
P.S never use Garena.com update files....they're filled with viruses