What happened, because it appears that it was working for you...
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When did you first download and install it? There is a 30 day limit on Trials. Once you have installed it, the clock starts ticking, giving you up to 30 days. There are some things that may trigger a built in anti-piracy protection, which can stop the trial early, one is if you had to reset your clock/calendar on your PC. VS will treat this as an attempt to circumvent the trial...
The only way around this is to reformat your harddrive. You might also look at the possibility of D.E.P. Sometimes this will prevent programs from running. To Exempt a program from DEP do the following:
1. Right-click on My Computer and Select Properties
2. In the System Properties dialogue that opens click on the Advance Tab.
3. Click on the Settings button for
Performance.
4. In the Performance Options, click on the 3rd tab, Data Execution Prevention.
5. Click the radio button for
Turn on DEP for all.....
6. Click on the
Add button, a window will open that you can navigate to where the executable file for VS, MSP, PI or whatever program you're having problems with, is located. Generally this is found under C:\Program Files\Ulead Systems\. However you may have it installed to some other location on your system.
7. Once you have found it, click on it to add it to the execeptions list.
Now if DEP was preventing your program from launching that should take care of it.