Account permissions / access problems

I have a computer that has started behaving strangely. I wrestled with whether to post in the malware forum or here, but since I can't seem to successfully run a HJT log right now, and since the behavior seems to be limited to this one login, I thought I would start here.

This computer has multiple logins, The accound "Dad" is an administrator account and seems to be behaving normally (or at least the things I describe below don't happen in this account). The account "Mom" is also an adminstrator account and has started behaving strangely. I started looking at it because "Mom" was complaining about slow connections to the internet and occasions where IE would not connect until she rebooted.

The first thing I tried to do was run MBAM, which I had installed on this computer from the Dad account some months ago. To my chagrin, it wouldn't run, but instead complained that it couldn't find it. So, I uninstalled (from the Dad account) and tried to reinstall from the Mom account, getting the error in attachment 1.

I then tried to run a HJT log to post here, and got the error in attachment 2. (I am, however, able to log into the Dad account and run a log).

Lastly, I tried to navigate to the C:\Program Files folder manually, and when I click on it get the error in attachment 3. I tried going into the Dad account, setting the Mom account to a Limited account, then back to an Adminstrator account to see if that would fix it, but no joy.

Any help or guidance would be appreciated.

Hi NyankeeC I suggest you still go ahead post in the malware forum. Despite that you are unable to run HJT properly, they, the malware fighters, have ways to bypass this, or other tools to use. Many malware types mess with user-profiles, such as the conficker infections which everyone speaks of lately. If it is clean, we are likely facing a corrupt user- profile of sorts, which sometimes happens. Regards