UAC bypass is possible, through tasksheduler in windows 7 you just need to add /AUTO in the program/scriptline
like this "C:\Program Files\CCleaner\CCleaner.exe" /AUTO (remember space after the " )
tested and working. created this little guide: youtube.com/watch?v=BveGUnBJEaE
have a look and let me know if it works
PS: if your on a notebook, you need to modify power settings under "conditions"