how to uninstall avast antivirus 11.1.2253 on windows 7

When I tried to reverse the system restore, the same error was received. (0xc0000022).) There are no other system restore points available. Details: An unspecified error occurred during System Restore. Your computer's system files and settings were not changed. After that I tried system restore to a restore point 2 days prior to this issue, and got the 0xc0000022 error ('System Restore did not complete successfully. bak profile, which still produced no results. I ran scandisk, which indicated that nothing was wrong, and the disc was clean. I tried the regedit fixes recommended on line (renaming the user profiles), without effect. This morning my (new) user account appears to have vanished: every time I restarted Windows 7, it continued to open temporary profiles and naturally I cannot access the files I created yesterday (which still seem to be there - since the used disk space on the C drive is the same as before):

After which the PC worked fine, and so I continued my work, saving all of my files (in folders on the desktop) before shutting down for the night. (The cooling fan, however, works now, so the PC shutting down when that occurs is no longer an issue.) I read that this high CPU usage can be caused by a corrupt User Profile, and so I decided to change mine - I created a new profile (yesterday), moved everything there (while backing up all of the files on other hard drives), and so forth, and then deleted the presumably corrupted profile (and the temporary profile that I created since three profiles are needed to perform the transfer of data).

There has also continued to be an issue with unusually high CPU usage (for example, when nothing is running), though not constantly. This happens several times a day, but the manifestation is so fast that, other than recognizing what it is, I have no idea what is causing it. In addition to the residual matter of the phantom floppy disk player, which I have not yet attended to (I went to Japan at the end of February, and contracted food poisoning the night before I left Korea), something else has continued to happen: from time to time, when I am watching a movie (such as one burned on a CD or on a HD, not streaming), or reading (this usually seems to happen when I am reading the news), I have occasionally noticed a (black) command prompt window appear for a fraction of a second before disappearing. However, there seems to still be something wrong with my PC.

Bruni, first of all, thank you for all of your help before.

How to uninstall avast antivirus 11.1.2253 on windows 7